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KTA |
A Comphrehensive Study of Molecular Gas Near AGN (topic is not available any more) |
Eisenhauer |
- Research group
- Max-Planck-Institue for Extraterrestrial Physics (MPE)
- Description
Accreting supermassive black holes (AGN) at the centers of galaxies are thought to play a crucial role in galaxy evolution by shutting down star formation through jets or outflows and transforming their host galaxy from star forming disks to quiescent ellipticals. However, studying the physical processes responsible for the feeding and feedback of AGN is difficult due to both the small size scale and variability of the AGN. The Local Luminous AGN with Matched Analogs (LLAMA) sample overcomes these issues by combining a nearby and complete volume-limited sample of AGN together with a matched sample of inactive galaxies. We have observed the LLAMA sample with a variety of world class telescopes and instruments and compiled a large, multiwavelength dataset. This master's thesis will focus on a combined analysis of the SINFONI and ALMA datasets to investigate the nature and structure of molecular gas around galaxy nuclei. SINFONI and ALMA uniquely provide tracers of molecular gas at different temperatures and using the measurements we will test 1) differences in the amount and structure of molecular gas around AGN and inactives 2) differences in the excitation of molecular gas around AGN and inactives and 3) determine accurate conversions from the specific tracers to total molecular gas mass.
Contact: Taro Shimizu <shimizu@mpe.mpg.de>
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KM, KTA, BIO, AEP, BEMP |
Advanced image processing for clinical darkfield chest X-ray applications |
Pfeiffer |
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BSC, KM, KTA, BIO, AEP, BEMP |
Advanced material decomposition using clinical dual-layer spectral CT (topic is not available any more) |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will explore the application of advanced three-material decomposition algorithms for use at latest clinical spectral (dual-layer) CT systems. The project will be carried out in close collaboration with the Department of Radiology at the TUM Klinikum Rechts der Isar.
Character of thesis work: experimental physics (50%) & image processing (50%)
For more information, please contact: Johannes Hammel (johannes.hammel@tum.de), Lorenz Birnbacher (lorenz.birnbacher@tum.de), Daniela Pfeiffer (daniela.pfeiffer@tum.de), or Franz Pfeiffer (franz.pfeiffer@tum.de)
- Contact person
- Johannes Hammel
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KM, KTA, BIO, AEP, BEMP |
Advanced processing algorithms for X-ray dark-field CT reconstruction |
Pfeiffer |
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KM, KTA, BIO, AEP, BEMP |
AI/machine learning algorithms for the automated detection of respiratory diseases in chest CT scans |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will focus on using AI/machine learning algorithms (i.e. deep convolutional neural networks) for the automated detection of respiratory diseases (e.g. COPD, COVID-19) in chest CT scans. The project will be carried out in close collaboration with the Department of Radiology at the TUM Klinikum Rechts der Isar and an external industrial collaborator.
Character of thesis work: mainly computational physics & image processing
For more information, please contact: Manuel Schultheiß (manuel.schultheiss@tum.de), Tobias Lasser (tobias.lasser@tum.de), or Franz Pfeiffer (franz.pfeiffer@tum.de).
- Contact person
- Manuel Schultheiß
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KTA |
Alarm-Software fuer Gammastrahlungs-Transienten (topic is not available any more) |
Greiner |
- Research group
- Max-Planck-Institue for Extraterrestrial Physics (MPE)
- Description
The recent detection of gravitational waves (GW) with the advanced LIGO/Virgo instruments in conjunction with a short gamma-ray burst (GRB) has surprised gamma-ray astronomers because of the substantially different properties of the GRB signal as compared to canonical GRBs. This motivates an "open-mind" search for untriggered transient events in the data stream of the gamma-ray burst monitor (GBM) on the Fermi satellite. With two previous Bachelor theses we have developed a physical background model, paving the way for automated searches, and subsequent source and background fitting. This thesis shall be devoted to establishing a Python program for identifying long-term (> few minutes up to a year) transients in Fermi/GBM data, localizing them on the sky, and deriving basic properties (spectrum, light curve). One pot\ential application is to determine the spectral properties of the predicted seasonal variation of the background due to axions. The project includes elements from computational and observational high-energy astrophysics, and will allow for obtaining extensive knowledge on the broad class of high-energy transients. Some background in astrophysics is advantegeous, but affinity with Python programming is a must. Contact: Jochen Greiner, jcg@mpe.mpg.de, MPE Room 1.3.13, Tel. 30000-3847
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KM, AEP |
All Solid State Batteries |
Bandarenka |
- Research group
- Physics of Energy Conversion and Storage
- Description
- An ever increasing demand for high density energy storage has led to the evolution of All Solid State Batteries (ASSB). While the concept of a solid ion conductors has been around for decades, the field of ASSB is relatively new. With novel materials, the ionic conductivity matches that of liquid electrolytes. However, a major challenge remains to be understood and solved: the electrode/electrolyte interface. Involving two different solid materials, this interface is subject to mechanical stress, material decomposition and electrochemical processes. In this work, this interface will be investigated through electrochemical experiments. Not only will you perform measurements on state-of-the-art equipment on various material systems but the physical modelling of the underlying physics-chemical processes will give you an insight into the various time domains involved.
After initial literature research, a thorough introduction into our methods and to the experimental setups involved, the electrochemical model will be refined in an iterative procedure. Supporting the electrochemical model by other experimental and theoretical means will also be a part of your work.
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KM, AEP |
Amphiphilic polymeric conetworks are mechanically more stable than pure hydrogels and are used in contact lenses. They swell both in water and organic solvents, which qualifies them for cleaning purposes. Using star block copolymers as building blocks, highly ordered gels with high toughness are obtained. In the proposed master thesis, the star block copolymers as well as the resulting conetworks shall be investigated in organic solvents using dynamic light scattering and small-angle X-ray scattering. The candidate should be interested in experimental work as well as in data analysis and molecular interpretation. |
Papadakis |
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KTA |
Analyse der Zerfälle B_(s)->D_(s) {K, pi} in der schwachen effektiven Theorie |
van Dyk |
- Research group
- Theoretical Elementary Particle Physics
- Description
A recent analysis of the B_(s)->D_(s) {K, pi} within the Standard Model of particle physics has uncovered a significant discrepancy between theory predictions and experimental measurements. As part of the proposed thesis you will classify the possible contributions beyond the Standard Model through the use of the weak effective theory. You will derive analytical formulae for the decay observables in the presence of these contributions in the framework of QCD factorisation. As a last step, you will use numerical and statistical methods to obtain on constraints on the contributions, within the framework of the EOS software.
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KM, AEP |
Anomaler Hall Torque in voll epitaktischen Heterostrukturen |
Back |
- Research group
- Experimental Physics of Functional Spin Systems
- Description
- The anomalous Hall effect (AHE), i.e., an additional Hall resistivity induced by the magnetization m in ferromagnetic materials, is a well-known effect. Although it was discovered more than a century ago, we deeply understood the underlying mechanism only recently. Experimentally, for most cases, this effect is discussed in term of generating transverse voltages or currents.
In this Master thesis, we would like to demonstrate an unexplored property of the AHE: i.e., can the anomalous Hall effect generate a spin current and subsequently switch the magnetization of an ajacent ferromagnet?
The prototypical sample is a fully epitaxial Fe/GaAs/GaMnAs heterostructure grown by molecular beam epitaxy, and the Hall bar device will be fabricated by electron-beam lithography.
- Contact person
- Lin CHEN
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KM, KTA, BIO, AEP, BEMP |
Application of Machine Learning / AI-based image processing to X-ray dark-field imaging (topic is not available any more) |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will focus on applying modern machine learning / AI-based image processing methods to grating-based X-ray dark-field imaging with the aim of improving medical diagnostics and reducing radiation exposure to patients.
The project will mainly involve data analysis and image processing (primarily in Python).
Character of thesis work: mainly computational physics & image processing
For more information, please contact: Florian Schaff (florian.schaff@tum.de) or Franz Pfeiffer (franz.pfeiffer@tum.de)
- Contact person
- Florian Schaff
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KM, AEP |
Beeinflußung der Spin-Bahn-Wechselwirkung durch die elektronische Zustandsdichte |
Back |
- Research group
- Experimental Physics of Functional Spin Systems
- Description
- Several years ago, we have shown that robust spin-orbit fields (SOFs) exist at the single crystalline Fe/GaAs interface. The SOFs originate from Byckov-Rashba and Dresselhaus spin-orbit interaction due to the reduced symmetry at the interface, and have the following properties:
1) The in-plane SOF is proportional to density of states (DOS) at Fermi level (EF).
2) The out-of-plane SOF is proportional to all the states below EF.
It is well known that in the CoFe alloys the DOS at EF depends strongly on the relative concentrations. Therefore, it is expected that the interfacial SOFs can be manipulated by Co alloying. In this Master thesis, we will address the following points:
1) We will replace Fe by FexCo1-x, and carry out spin-orbit torque ferromagnetic resonance (SOT-FMR) measurements.
2) To prove that the SOFs can be modulated by Co alloying
3) If the above question is answered positively, we will try to switch the magnetization direction using a d.c. current.
- Contact person
- Lin CHEN
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KM, BIO, AEP, BEMP, M2L, TMP |
Biophysik der Nahrungsaufnahme im Darm |
Alim |
- Research group
- Theory of Biological Networks
- Description
The gut microbiota has a direct impact on health, influencing how the gut digests nutrients. The microbiota itself and the nutrients are influenced by the gut contractions and the fluid flow produced by them. How do different contractions influence the dispersal of bacteria and nutrients? You will simulate the fluid flows and particle dispersal in a contracting tube (possible methodologies: COMSOL, Matlab, C, etc.). The aim is to quantify which type of contraction mixes the nutrients and the bacteria better, helping to understand the basic principle behind gut functioning.
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KM, AEP, QST |
Breitbandiges dispersives Auslesen von supraleitenden Qubits |
Gross |
- Research group
- Technical Physics
- Description
-
An essential step for implementation of quantum computing architectures is an efficient readout of qubits. In the field of superconducting quantum circuits, this is typically realized by dispersively coupling a superconducting qubit to a microwave resonator. Then, the frequency of the resonator depends on the state of the qubit. The former can be extracted by probing the resonator with a coherent tone. However, efficiency of this readout approach is fundamentally limited by quantum laws. The corresponding threshold is commonly known as the standard quantum limit and bounds quantum efficiency of the readout process by 50%. Nevertheless, recent investigations have shown that it is possible to circumvent this limit and reach quantum efficiency of the qubit readout of 100% by exploiting broadband readout signal combined with Josephson parametric amplifiers.
The goal of this Master project is to build a proof-of-principle experimental setup and perform microwave cryogenic measurements on a superconducting transmon qubit in the broadband regime in order to demonstrate violation of the standard quantum limit in the dispersive readout.
- Contact person
- Michael Renger
- Kirill Fedorov
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KM, AEP, QST |
Characterization and fabrication of superconducting multi-qubit devices |
Filipp |
- Research group
- Technical Physics
- Description
Superconducting quantum circuits form the basis of current quantum processing platforms that allow to run first algorithms. However, to make practical use of coherent quantum systems, there is considerable fundamental challenges ahead: overcoming decoherence of qubits caused by interactions with an uncontrolled environment, improving qubit control to avoid systematic errors, developing scalable multi-qubit architectures while maintaining high level of coherence, or the efficient generation of highly-entangled quantum states in quantum-classical hybrid schemes.
In this project, we plan to design and fabricate high-coherence superconducting microwave circuits (qubits and couplers) that allow for multi-qubit operations and therefore enhance the connectivity of a quantum processor. The characterization of these circuits in a cryogenic microwave measurement setup is an integral part of the project. The master project also consists of fabrication of the circuits using state-of-the-art micro- and nanofabrication techniques.
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KTA |
Characterization of the next-generation TRISTAN prototype detector |
Mertens |
- Research group
- Dark Matter
- Description
Scientific motivation:
Does there exist an undiscovered type of neutrino, a so-called sterile neutrino? Could this particle be the Dark Matter? These are among the most topical open questions in Astroparticle physics at the moment.
The aim of the TRISTAN project, is to develop a novel multi-pixel Silicon Drift Detector system to upgrade the KATRIN apparatus. This upgrade would allow the KATRIN experiment to search for this hypothetical new particle.
Thesis Topic:
The topic of this Thesis project is the characterization of the next-generation TRISTAN prototype detectors. The goal of this project is a detailed understanding of the detector response to photons and electrons. For this purpose you will perform measurements with x-ray calibration sources and with an electron microscope at the Semiconductor Laboratory of the Max Planck society in Munich. For this purpose a dedicated test stand has to be designed and fabricated. The measurements and data analysis will be complemented with detailed Monte Carlo simulations of the particle interactions in the detector and the signal generation.
You will gain & learn:
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Learn about astroparticle physics
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Detailed understanding of semiconductor detector technology
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Expertise in experimental hardware work
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Programming in Python and C++
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Work in a fun team with lots of social events
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KM, AEP, QST |
Charakterisierung des Prototyps für ein Quantum Local Area Network (Q-LAN) |
Deppe |
- Research group
- Technical Physics
- Description
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Quantum technologies are on the verge of revolutionizing high-security communication owing to advanced protocols such as teleportation and remote-state preparation. Development of quantum local area networks (QLAN) is an important milestone in this field. Such a microwave QLAN can be realized as superconducting transmission line cooled down to millikelvin temperatures. In practice, this system requires careful characterization measurements with quantum signals propagating over the cryogenic link in order to determine the effective losses, noise level, and other imperfections.
In this work, the main goal is to investigate a new prototype of a quantum local area network (QLAN) established between two neighboring laboratories. This includes analysis of experimental results with theoretical and numerical methods. This project will provide you an excellent opportunity to gather expertise in a broad range of topics from quantum physics to microwave engineering and cryogenic techniques.
- Contact person
- Matti Partanen
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KTA |
ComPol - a Compton telescope inside a nano satellite |
Mertens |
- Research group
- Dark Matter
- Description
Scientific motivation:
The structure of astrophysical compact objects e.g. black hole binaries (BHB) can not be resolved with optical methods. Therefore one has to use other methods to get informations on processes in and around these systems. By measuring the polarization of the emitted hard X-rays it is possible to draw conclusions on their production mechanism and the geometrical structure of BHBs. The CubeSat project ComPol (Compton Polarimeter) aims at measuring spectrum and polarization of the BHB Cygnus X-1 in the hard X-ray range (20 - 2000 keV).
Since it will be a CubeSat based mission, the whole system has to be very compact to fit in the satellites volume (~10x10x30cm³). The small detector area together with strong weight limitations makes it ambitious to achieve a good sensitivity. Besides lab tests simulations are needed to get the best out if it.
Thesis Topics:
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Simulation based design study for ComPol, a Compton telescope inside a Nano-satellite
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Characterizing and testing components of the first ComPol prototype
You will gain & learn:
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Learn about astroparticle physics
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Understand the working principle of Compton telescopes
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Detailed understanding of semiconductor detector technology
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Expertise in experimental hardware work
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Knowledge of Monte Carlo particle simulation with Geant4
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Programming in Python and C++
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Work in a fun team with lots of social events
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KTA, AEP |
Confinement of charged nanoparticles: Quadrupole Ion Trap - particle detection |
Eisenhauer |
- Research group
- Max-Planck-Institue for Extraterrestrial Physics (MPE)
- Description
- Charged particles trapping and isolation, originally started in fundamental physics some 60 years ago, has nowadays numerous applications with interdisciplinary impact from astrophysics to biology. In laboratory astrophysics, ion traps are one of the few instruments allowing studies at conditions approaching those in the interstellar medium, where low temperatures (tens of K) and number densities (<10^10 cm^-3) prevail.
In this project the main goal is to develop an detection system for a charged and trapped nanoparticles of sizes ~500 nm in an cryogenic quadrupole ion trap. This is an experimental physics project, the participant will work to integrate the hardware (laser, detector, DAq) together with customised software in order to accomplish the task. This project will offer a deep insight into photon detection using APD (avalanche-photodiode), signal filtering and processing using Fourier transforms and data acquisition using customized hardware.
Contact:
Dr. Pavol Jusko
Prof. Paola Caselli
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BSC, KM, KTA, AEP |
CRESST: freezing cold, deep underground, but illuminating the dark |
Schönert |
- Research group
- Experimental Astro-Particle Physics
- Description
The CRESST (Cryogenic Rare-Event Search with Superconducting Thermometers) experiment operated at the Gran Sasso underground laboratory employs highly sensitive cryogenic detectors to the search for signals of the elusive dark matter particles, a main ingredient of the Universe whose nature is still unknown.
The energy thresholds reached in CRESST-III are the lowest in the field, making CRESST the most sensitive experiment to light dark matter. Optimisation of the tungsten thin-film thermometers and of the techniques for data analysis promise still improvement in energy threshold, which could significantly boost the physics reach of the experiment.
Scientific topics
A student can contribute to:
- design, production and prototyping of new CRESST detectors in Munich
- development of high purity crystals
- development of new software tools for data analysis
- dark matter data analysis
and, if interested, can participate in the operation of the main experiment at Gran Sasso.
Thesis can be carried out at the Chair for astroparticle physics of the Physics Department and/or at the Max-Planck-Institute for Physics (MPP). Supervision at the Physics Deptartment by Prof. Schönert / Dr. Strauss and at the MPP by Prof. Schönert / Dr. Federica Petricca. Please contact schoenert@ph.tum.de, raimund.strauss@ph.tum.de and petricca@mpp.mpg.de for further information.
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KM, KTA, BIO, AEP |
Data analysis for high-resolution quantitative phase-contrast imaging at highly brilliant sources (topic is not available any more) |
Herzen |
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KTA |
Data analysis for the KATRIN experiment |
Mertens |
- Research group
- Dark Matter
- Description
Scientific motivation:
What is the mass of the neutrino? This is one of the most fundamental open questions in Astroparticle Physics today. We know from neutrino oscillations that neutrinos must have a mass, but its actual value is still unknown. The knowledge of the neutrino mass would be an important key to understand the formation of structures in the early universe and it could help to shed light on the fundamental origin of masses.
The Karlsruhe Tritium Neutrino (KATRIN) experiment is a direct neutrino mass experiment, which is designed to determine the neutrino mass via a precise measurement of the tritium beta decay spectrum. KATRIN just started data taking in April 2019. The goal is to reach a sensitivity to the neutrino mass of 200 meV after 3 years of data taking. So, right now is the perfect moment to join the experiment!
Thesis Topic: In this Thesis project you participate in the analysis of the KATRIN data. You will analyze new data sets, acquired in the near future, which will provide unprecedented sensitivity to the neutrino mass. Besides using existing techniques we also focus on developing novel analysis tools based on Bayesian techniques and neural networks. Finally, you will gain a deep understanding of the experiments, as systematic uncertainties in the theoretical description of the measured beta-decay spectrum are of key relevance to achieve the desired sensitivity.
You will gain & learn:
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Participate in world-leading experiment to directly determine the neutrino mass
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Learn about astroparticle physics
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In-depth knowledge on data analysis
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Programming in C++ and Python
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Work in a fun team with lots of social events
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BSC, KTA, AEP |
Deep neural networks applied to multimessenger astronomy: real-time neutrino astronomy. |
Resconi |
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KTA |
Detector R&D and data analysis with the LEGEND experiment |
Mertens |
- Research group
- Dark Matter
- Description
Motivation:
The observation of neutrinoless double beta (0𝜈ββ) decay would establish the Majorana nature of neutrinos and explicitly show that lepton number conservation is violated. In their search for the rare decay in the isotope Ge-76, the GERDA and Majorana Demonstrator experiments have achieved the lowest backgrounds and best energy resolutions of any 0𝜈ββ decay experiment. Building on the successful results of these experiments, the Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay (LEGEND) collaboration aims to develop a phased 0𝜈ββ decay experimental program. The first phase of LEGEND, a 200 kg measurement utilizing the existing GERDA infrastructure at LNGS in Italy, is expected to start in 2021. Be part of this amazing collaboration with about 200 scientists from all over the world.
Thesis topics:
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Development and characterization of ASIC-based readout electronics for Germanium detectors (with possibility of research stay at Berkeley lab)
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Analysis of first LEGEND data (e.g. focus on optimization of energy resolution)
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Pulse shape simulations (e.g. investigation of impact of diffusion and self-repulsion)
Technical skills and scientific environment:
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Data analysis methods in experimental physics, C++ and Python programming
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Electronics and cryogenics (liquid Argon & Nitrogen)
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Astroparticle physics
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Scientific writing and presentation of scientific results
Scientific supervision:
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KM, AEP |
Development of a flexible sample environment for neutron scattering on multi-stimuli responsive hydrogel thin films |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
Since several decades, multi-stimuli responsive hydrogels are attracting the scientific focus, based on their versatile applicability in the fields of sensoric, drug delivery or nano-switches. When changing an external stimulus such as pH, temperature, pressure or light illumination specific dynamic processes are taking place inside the hydrogel network. Thus, these polymers are an interesting foundation for new research fields such as green architecture or soft robotics. In order to apply responsive hydrogels in the aforementioned technical fields, the mechanisms behind these dynamic processes are an object of current research.
Neutron scattering is a powerful and suitable measurement technique for studying dynamic activities inside a hydrogel. Information about thickness, material composition and roughness can be obtained, even during dynamic processes.
Currently, the European Spallation Source (ESS) is being built in Lund, Sweden. It is envisioned to be the worlds most powerful neutron spallation source and will provide new possibilities in the field of neutron research. In a cooperation between Bielefeld, Darmstadt and Munich a modular sample environment for the SKADI beamline, a small angle scattering beamline at the ESS is under development.
We are currently developing the setup for grazing incidence small angle neutron scattering (GISANS) and as such development is required on the final design and layout of the measurement setup, a quick and reliable sample change system, the electronical circuit and connections to the measurement chamber, a remote-control of all elements, the read-out system.
First measurements with the constructed sample environment will be performed at neutron scattering instruments at the MLZ. Furthermore, the project offers the possibility of collaboration on national and international neutron radiation centers (ILL – Grenoble, ESS - Lund).
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KTA |
Development of a theoretical model for the keV sterile neutrino search |
Mertens |
- Research group
- Dark Matter
- Description
Scientific motivation:
Does there exist an undiscovered type of neutrino, a so-called sterile neutrino? Could this particle be the Dark Matter? These are among the most topical open questions in Astroparticle physics at the moment.
The aim of the TRISTAN project, is to develop a novel multi-pixel Silicon Drift Detector system to upgrade the KATRIN apparatus. This upgrade would allow the KATRIN experiment to search for this hypothetical new particle.
Thesis Topic:
To search for keV sterile neutrinos in the differential energy spectrum of tritium a sophisticated model is required, which will be the main aspect of this Thesis topic. You will develop and extend the existing model used in the KATRIN experiment for the neutrino mass measurement, to suite the keV sterile neutrino search. A key aspect of this investigation is the understanding of systematic uncertainties and their impact on the final sensitivity of the final TRISTAN experiment. Additionally, already now we can extract an differential energy spectrum from the ongoing measurements through the Forward Beam Monitor, where you can test your model and may extend the current limits for keV sterile neutrinos.
You will gain & learn:
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Learn about astroparticle physics
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In-depth knowledge on data analysis
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Programming in Python and C++
-
Work in a fun team with lots of social events
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KTA |
Die Physik unterschiedlicher Gammastrahlungs-Transienten |
Greiner |
- Research group
- Max-Planck-Institue for Extraterrestrial Physics (MPE)
- Description
- The gamma-ray sky is very active, much more than the optical or X-ray sky. In addition, deep sky surveys for neutrinos, gravitational waves, radio or TeV Transients is presently performed. The understanding of these transients is helped dramatically by using multi-wavelength and multi-messenger information. With two previous Master theses we have developed a sophisticated program package for an automated daily search for gamma-ray transients in Fermi/GBM data, and a subsequent follow-up search in the all-sky Swift survey for better localization.
This thesis shall be devoted to use this software package to (i) detect transients over one year, (ii) analyse the GBM data for these transients (derive position, spectrum), (iii) identify X-ray counterparts with Swift, (iv) establish a "population" analysis of such bright transients according to different source types, (v) correlate with other surveys such as eROSITA, HAWC, SKA, and (vi) investigate the different physical mechanisms underlying the diverse types of transients.
The project includes elements from computational and observational high-energy astrophysics, and will allow for obtaining extensive knowledge on the broad class of high-energy transients.
Some background in astrophysics is advantageous, but affinity with Python programming is a must.
Contact: Jochen Greiner, jcg@mpe.mpg.de, MPE Room 1.3.13, Tel. 30000-3847
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BSC, KM, AEP, QST |
Durchstimmung der Amplitude des Spin-Hall-Magnetwiderstands (topic is not available any more) |
Gross |
- Research group
- Technical Physics
- Description
The exchange of spin angular momentum between the localized magnetic moments of a magnetically ordered insulator and the spin polarization of the conduction electrons in an adjacent metallic electrode with large spin-orbit coupling gives rise to interfacial spin mixing. This manifests itself as a characteristic angular dependence of the metal’s resistivity on the magnetization direction of the insulator’s magnetic sublattices, denoted as “spin Hall magnetoresistance (SMR)”. The effect was first observed in ferrimagnetic Y3Fe5O12/Pt thin film heterostructures and recently also reported in antiferromagnetic NiO/Pt and α-Fe2O3/Pt. While the phase of the SMR oscillations is well understood and explained by theory, their amplitude, however, is still a matter of debate, since various extrinsic as well as intrinsic parameters play a crucial role. The goal of this master’s thesis is to study the correlation of the SMR amplitude to the density of magnetic ions and their spin magnetic moments in different magnetically ordered insulating oxides.
We are looking for a master student interested in thin film technology for the fabrication and investigation of magnetic insulator/normal metal bilayer structures. The master project will provide a comprehensive introduction into laser molecular beam epitaxy (laser-MBE) as well as electron beam physical vapor deposition, high-resolution X-ray diffraction (HRXRD), atomic force microscopy (AFM), superconducting quantum interference device (SQUID) magnetometry, photolithography, and angle-dependent magnetotransport measurements.
- Contact person
- Matthias Opel
- Stephan Geprägs
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BSC, KM, KTA |
Dynamik im stark korrelierten Hubbard Modell |
Knap |
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KM, AEP, QST |
Elektronenspindynamik in einer stark koppelnden Umgebung |
Hübl |
- Research group
- Technical Physics
- Description
Modern quantum circuits allow to study strong light-matter interaction in a variety of systems. This so-called strong-coupling regime is key for many aspects of quantum information processing. This project focusses on strong coupling between a paramagnetic electron spin ensemble and a superconducting microwave resonator. Strong coupling is an established phenomenon in this system. However, many aspects regarding the dynamics of this coupled system as well as the non-linear response properties are not fully understood, yet, and we will address these aspects within this project. For this project, we will use superconducting microwave resonators based on NbTiN and spin paramagnetic spin ensembles of phosphorous donors and erbium centers in silicon.
We are looking for a highly motivated master student joining this project. Within your thesis, you will address questions regarding the dynamic response of a strongly coupled system based on a paramagnetic spin ensemble and a microwave resonator. In this context, you will fabricate and optimize microwave resonators and operate them at cryogenic temperatures. In addition, you will use complex microwave pulses, to control the coupled system and experimentally investigate its dynamical response. Within the project, you will learn how to fabricate superconducting microwave resonators in our in-house cleanroom and how to synthesize microwave pulses using arbitrary waveform generators
- Contact person
- Rudolf Gross
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BSC, BIO, AEP |
Entwicklung einer Mikrofluidik zur Steuerung von Organoid Wachstum |
Bausch |
- Research group
- Cellular Biophysics
- Description
Organoide sind selbstorganisierte Mini-Organe aus Stammzellen. Es gelang kürzlich Bauchspeicheldrüse Organoide im Labor zu etablieren, die die wesentlichen Entwicklungsstufen des Pankreas nachvollziehen. Um diese für Pharmakologische Anwendungen nutzbar zu machen, müssen neue Technologien entwickelt werden. Im Rahmen der Arbeit sollen Mikrofluidik Kammern entwickelt werden, die es erlauben gezielt das Wachstum von Organoiden zu steuern und lokal zu untersuchen. Zum Einsatz kommen modernste optische und mikromechanische Methoden, kombiniert mit zellbiologisch und medizinschen Anwendungen.
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KTA |
Entwicklung eines neuartigen polarisationssensitiven supraleitenden Neutronendetektorkozepts |
Fierlinger |
- Research group
- Precision Measurements at Extreme Conditions
- Description
The project deals with the development of a miniature superconducting polarization sensitive slow neutron detector. As a completely novel idea, the device has a variety of future applications, among those a future next-generation experiment to measure the electric dipole moment of the neutron (EDM), which would through this development gain orders of magnitude in sensitivity. The EDM measurement in turn is key for the explanation of the excess of matter vs. antimatter in the Universe, making our small-scale R&D project potentially highly interesting. If you like this project, please dont hesitate to contact Roman Gernhäuser or Peter Fierlinger
- Contact person
- Roman Gernhäuser
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BSC, KTA, AEP |
Entwicklung eines Sub-Nanosekunden-Zeitsynchronisationssystems für sehr verteilte Experimente in der Astro- und Teilchenphysik. |
Resconi |
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BSC, KM |
Entwicklung selbsttriggernder, hochratenfähiger Driftrohrkammern für Experimente an zukünftigen Hadroncollidern |
Kortner |
- Research group
- Hadronic Structure and Fundamental Symmetries
- Description
Die Detektorentwicklung der nächsten Jahre wird sich auf den 100-TeV-Hadroncollider, das nächste große Zukunftsprojekt in der experimentellen Teilchenphysik konzentrieren. Für das Myonsystem der Detektoren an diesem Collider werden Myonkammern benötigt, die eine hohe Myonnachweiseffizienz und Ortauflösung selbst bei hohem Gammastrahlungsuntergrund aufweisen. sMDT-Kammern, das sind Kammern mit zylindrischen Driftrohren mit 15 mm Durchmesser, scheinen hierfür besonders gut geeignet. Allerdings muss ihre bereits gute Hochratenfähigkeit verbessert werden. Zwei sich ergänzende Ansätze werden hierbei verfolgt. Zum einen kann man die Ortsauflösung und Myonnachweiseffizienz bei hohem Raten durch eine hierfür angepasste Elektronik erhöhen. Zum anderen eröffnen neue Zeitdigitalwandler mit Pikosekundenauflösung die Möglichkeit durch die Auslese der Driftrohre an beiden Enden, den Ort des Teilchendurchgangs in allen drei Raumkoordinaten zu messen. Durch geschickte Auslegung der Ausleseelektronik können diese Myonkammern sogar selbsttriggernd betrieben werden.
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BSC, KTA |
Entwicklung und Test neuer schneller Ausleselektronik fuer kuenftige Beschleunigerexperimente |
Kroha |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
- Experimente an kuenftigen Hochenergiebeschleunigern benoetigen wegen der hohen Teilchenkollisionsraten immer schnellere Ausleseelektronik, wobei die Messgenauigkeit nicht beeintraech-tigt werden darf. Verschiende Konzepte dafuer werden derzeit am Max-Planck-Institute in Muenchen entwickeltund in integrierte Schaltkreise (sog. ASIC Chips) in modernster Halbleitertechno-logie ueberfuehrt. Die verschiedenen Stufen der Entwicklung sollen in Bachelor- und Masterarbeiten im Messlabor und auf einsatzbereiten Teilchendetektoren unter den realistischen Betriebsbedingungen getestet werden. Die Testergebnisse fuehren wiederum zu einer Weiterentwicklung der Chips.
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BSC, KTA |
Entwicklung von numerischen Algorithmen zur Integration in hochdimensionalen Räumen und Anwendungen auf physikalische Probleme |
Caldwell |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
You will develop novel integration algorithms in high-dimensional spaces. Possibilities include various forms of importance sampling algorithms and the further development of the Adaptive Harmonic Mean Integration algorithm using differently chosen volumes for integration. Test problems will be chosen from physics projects to validate the algorithm. Good programming skills and knowledge of linear algebra are a pre-requisite for the project.
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KM, KTA, BIO, AEP, BEMP |
Evaluation of limited angle, sparse sampling CT algorithms for head and chest CT applications (topic is not available any more) |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will focus on the potential usage of advanced CT reconstruction algorithms (i.e. model-based iterative CT) for reducing the number of projections in neuro-radiological CT applications. The project will be carried out in close collaboration with the Department of Radiology at the TUM Klinikum Rechts der Isar and an external industrial collaborator.
Character of thesis work: mainly computational physics & image processing
For more information, please contact: Clemens Schmid (clemens.schmid@tum.de), Tobias Lasser (tobias.lasser@tum.de), or Franz Pfeiffer (franz.pfeiffer@tum.de).
- Contact person
- Clemens Schmid
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KM, KTA, BIO, AEP, BEMP |
Evaluation of spectral photon-counting detectors for improvements in 2D (panoramic) dental imaging applications |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will explore the use of latest hybrid-pixel photon-counting detectors for improving the image quality in 2D (panoramic) dental imaging applications. More specifically, the project aims at developing advanced dual-energy/ spectral artefact reduction algorithms and their experimental demonstration of their applicability in preclinical experiments. The project will be carried out in close collaboration with an industrial collaboration partner in the Munich area.
Character of thesis work: experimental physics (50%) & image processing (50%)
For more information, please contact: Thorsten Sellerer (thorsten.sellerer@tum.de), Franz Pfeiffer (franz.pfeiffer@tum.de)
- Contact person
- Thorsten Sellerer
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KM, KTA, BIO, AEP, BEMP |
Evaluation of spectral photon-counting detectors for improvements in 3D (cone-beam CT) dental imaging applications |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will explore the use of latest hybrid-pixel photon-counting detectors for improving the image quality in 3D (cone-beam CT) dental imaging applications. More specifically, the project aims at developing advanced dual-energy/ spectral artefact reduction algorithms and their experimental demonstration of their applicability in preclinical experiments. The project will be carried out in close collaboration with an industrial collaboration partner in the Munich area.
Character of thesis work: experimental physics (50%) & image processing (50%)
For more information, please contact: Thorsten Sellerer (thorsten.sellerer@tum.de), Franz Pfeiffer (franz.pfeiffer@tum.de)
- Contact person
- Thorsten Sellerer
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KM, AEP |
Fabrication and characterization of high-efficiency printed perovskite solar cells |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
-
In this work, you will manufacture your own printed perovskite solar cells and build a new setup for current-voltage measurements of the illuminated solar cells to determine their efficiency.
Next-generation perovskite solar cells show very high efficiencies competitive to silicon solar cells and have the potential to revolutionize photovoltaics in the near future. Their heart is a thin-film absorber that can be easily deposited onto glass or flexible substrate using a slot-die printer. You will build solar cells with printed perovskite absorber layers, that are compatible with commercialization. Our group has long-standing experience in perovskite fabrication and printing deposition that you can rely on during your work in our group. For characterization, we have the possibility to conduct X-ray scattering for structural analysis and SEM measurements for real-space imaging, among others.
However, the key method of characterizing solar cells is to measure the diode-like current-voltage-behavior of the cell under well-known laboratory illumination. From this measurement, the most important performance parameters such as the efficiency, current characteristics, and internal resistances of your cells can be extracted. In our labs, we already have such a device, but it does not allow measuring our solar cells in inert atmosphere. In this work, you will build a new setup that enables these measurements inside an inert gas atmosphere. The basic concept is already set up, I would be happy if you wish to learn more about this. Further tasks will include strategic planning of the individual components, drawing parts in CAD, guiding our workshop in constructing the parts, and the final assembly of the setup. You will test the setup by characterizing your printed perovskite cells and correlate the findings to your chosen experimental parameters.
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KM, KTA, BIO, AEP |
Fast and dose-equivalent breast computed tomography (topic is not available any more) |
Herzen |
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KM, AEP, QST |
FPGA-basiertes Rückkopplungsverfahren für die Mikrowellen-basierte Quantenkommunikation |
Gross |
- Research group
- Technical Physics
- Description
-
Quantum experiments often require fast and versatile data processing which allows for a quantum feedback operation. This approach opens the road to many fascinating experiments such as quantum teleportation, entanglement purification, quantum error correction, among others. Here, we would like to develop a specific measurement and feedback setup, based on a field programmable gate array (FPGA), for experiments with propagating quantum microwaves.
The main goal is to program and experimentally test a specific image for an FPGA which would allow for acquisition of microwave signals and feedback generation over few hundred of nanoseconds. This timescale is the prerequisite for exploiting quantum correlations effects for quantum communication and cryptography protocols with propagating squeezed microwaves which are conducted in our lab. This project will offer a deep insight into the state‑of‑the‑art FPGA devices, microwave measurements, and cryogenic experiments with superconductors.
- Contact person
- Michael Renger
- Kirill Fedorov
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KTA |
Freeze-in dark matter and their implications on cosmology and terrestrial experiments |
Harz |
- Research group
- Theoretical Physics of the Early Universe
- Description
- So far, we can explain only 5% of our Universe by the standard model of particle physics. 25% of our Universe, however, consists out of “dark matter”. While we have different experimental hints for its existence, we do not know yet its true nature. With new experimental possibilities in the near future, so-called freeze-in scenarios receive increased interest. We want to study these models with respect to a modified cosmological history, their link to neutrino physics and their implications for experiments in more detail.
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BIO, TMP |
Growing shapes: Kinetics of integrating cell wall material into the envelope of a growing cell |
Gerland |
- Research group
- Theory of Complex Bio-Systems
- Description
The aim of this Master thesis is to explore different modes of cell wall growth, which is locally controlled by enzymes but has a global effect on the shape of the cell. Which schemes of enzymatic action permit stably growing cell shapes? And which ones can mimick the observed growth behavior of different bacterial species? These fundamental questions are surpisingly largely open, partially due to the difficulty of experimentally determining which local properties of the cell wall affect the enzymatic activity. In light of this experimental barrier, conceptual theoretical models can classify different plausible schemes by their large-scale behavior, which is more easily observed experimentally. This thesis will combine simulations of stochastic models for growing shapes with simple analytical toy models to address some of the open questions.
- Contact person
- Cesar Lopez Pastrana
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BSC, KM, AEP, QST |
Herstellung von verlustarmen Josephson-Kontakten für Quanten-Bauelemente |
Deppe |
- Research group
- Technical Physics
- Description
-
Josephson junctions (JJs) represent a fundamental building block of modern quantum circuits such as superconducting qubits or Josephson parametric amplifiers. The JJs are conventionally fabricated with Al while the surrounding quantum circuits are often made of Nb. Henceforth, there is a need of galvanic connection between them which includes removing Nb oxide via ion milling. As a consequence, one needs to develop a careful milling and fabrication technique in order to preserve a low-loss microwave environment in the close vicinity of JJs. This task is of paramount importance for achieving high coherence times of the related quantum devices.
The goal of this Master project is to develop a fabrication technique for Al/Nb superconducting circuits which will include Ar/O2 milling. This also includes cryogenic microwave studies of fabricated superconducting circuits (such as Josephson parametric amplifiers and transmon qubits) and participation in experiments towards quantum information processing with superconducting devices.
- Contact person
- Yuki Nojiri
- Kirill Fedorov
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KM, AEP |
High efficiency next generation organic solar cells |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
Next generation organic solar cells are solar cells beyond the silicon type photovoltaic devices. Organic solar cells have reached efficiencies in the champion solar cells well above 15%. Key element of such solar cells is the highly designed active layer, which transfers light into separated charge carriers. Aim of this experimental project is the preparation and full characterization of an active layer for high performance organic photovoltaic devices to further understand the fundamental correlation between morphology and solar cell performance. In this work a novel efficiency record-setting system will be investigated regarding the influence of an additional third component, in our case, either solvent additive or polymer. The project will involve a literature review, sample preparation, photovoltaic device fabrication and photoluminescent measurements. The focus is the usage of advanced scattering techniques for the determination of structural length scales of the active layer in the solar cell.
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KM, AEP |
High-field magnetotransport in an organic superconductor in proximity to the spin-liquid state |
Gross |
- Research group
- Technical Physics
- Description
A member of the k-(ET)2X family to be studied in this Master thesis exhibits a novel state of matter, quantum spin liquid at ambient pressure. Under a moderate pressure of about 3 kbar the material becomes metallic and superconducting. The aim of the work is to trace the evolution of the conducting system, particularly, of correlation effects, in close proximity to the superconductor-insulator phase boundary. The intrinsic properties of charge carriers will be probed by high-field magnetoresistance effects with the focus on magnetic quantum oscillations. A part of the experiments will be done at the European Magnetic Field Laboratory in steady fields up to 30 T or in pulsed fields up to 80 T.
Physics: Correlated electron systems; magnetic quantum oscillations; unconventional superconductivity.
Techniques: Strong magnetic fields; high pressures; cryogenic (liquid 4He; 3He; dilution fridge) techniques; high-precision magnetoresistance measurements.
Contact person: Mark Kartsovnik (mark.kartsovnik@wmi.badw.de)
- Contact person
- Mark Kartsovnik
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KM, AEP, QST |
High frequency optomechanical devices for quantum optomechanics |
Poot |
- Research group
- Quantum Technologies
- Description
The smaller a device is, the higher its resonance frequency becomes. For our future quantum optomechanics experiments we will be working with mechanical resonators that operate at GHz frequencies and simultaneously couple strongly to light. Using mechanical and optical band structure calculations, you will design, make, and measure phononic and photonic cavities. The project involves nanofabrication in the cleanroom, as well as using the extreme sensitivity offered by on-chip optomechanics. We are aiming for devices made from silicon nitride, which has a lot of tensile stress in it. For micromechanical structures this material gives much better mechanical properties compared to, for example, silicon devices. An important aspect of the project is to understand if this is also true for the high frequency devices.
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KM, KTA, BIO, AEP, BEMP |
High-resolution phase-contrast tomography at a rotating anode x-ray source (topic is not available any more) |
Herzen |
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BSC, KTA, AEP |
Hot Spot Population Analysis: indirect search for cosmic accelerators within the IceCube South Pole Neutrino Observatory. |
Resconi |
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KM, AEP, QST |
Imaging magnetic phases in 2D-materials |
Finley |
- Research group
- Semiconductor Nanostructures and Quantum Systems
- Description
The field of van der Waals heterostructures, which are stacks on individual atomically thin crystal sheets, has exploded in the last decade. Comparable to a game of Nano- Lego, those van der Waals stacks can be assembled in such a way that yield electro-optical nano-devices with essentially unlimited functionalities. Further, clever stacking can also result in new, fundamental physics.
The principal goal of this Masters thesis is to image magnetic phases of novel 2D-materials with a nitrogen-vacancy-based quantum camera system.
During the project, you will work in close collaboration with a small team of Ph.D. students and postdocs, therefore individual effort is key to drive this Masters's project.
Some knowledge in the areas of van der Waals stacking, optics or cleanroom fabrication will be beneficial, but secondary to your personal motivation and commitment to this project.
You should:
(1) Be highly motivated and self-driven, (2) be practically minded with a get-things-done attitude, (3) enjoy working across a wide range of tasks (processing, optics, electronics) and (4) be willing to work in a very small team on challenging things very long hours ...
You will get:
(1) the chance to work on current hot-topic issues in the area of 2D van der Waals physics (2) gain highly sought after abilities in the field of quantum technologies (3) a sound understanding of the physics in atomically thin materials and hopefully (4) a few nice papers.
- Contact person
- Andreas Stier
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KM, AEP |
Interaction between magnetic and conducting layers in molecular antiferromagnetic superconductors |
Gross |
- Research group
- Technical Physics
- Description
Hybrid materials combining nontrivial conducting and magnetic properties are of high current interest, especially in the context of potential spintronic applications. The organic charge transfer salts (BETS)2FeX4 with X = Cl, Br provide perfect natural structures of conducting and magnetic layers alternating on the single-molecule level. Our project is aimed at a quantitative study of the interaction between the two subsystems and of the role of the subtle structural modifications in this family. To this end, high-precision measurements of quantum oscillations in the electrical resistance and magnetization will be carried out on single crystals of these compounds under strong magnetic fields. The results will be analyzed in terms of electronic correlation and magnetic interaction effects.
Physics: Correlated electronic systems; magnetic ordering and superconductivity; magnetic quantum oscillations.
Techniques: Strong magnetic fields; magnetotransport; magnetic torque; cryogenic (liquid 4He and 3He) techniques.
Contact person: Mark Kartsovnik (mark.kartsovnik@wmi.badw.de)
- Contact person
- Mark Kartsovnik
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KM, AEP |
Interface control via plasma etching |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
-
One of the main challenges in solar cell and sensor manufacturing industry is to understand crucial influencing factors in solar cell design in order to increase the electricity output. A strict understanding of the internal architecture and nanoscale morphology of the polymer-metal nanocomposite films is required.
In a simplified approach of reduced complexity, we are interested in examining the correlation between the interfaces of a charged polymeric interlayer and a potential (metal) electrode. Polyzwitterions possess permanent charges and dipole moments. As such, polyzwitterionic thin (thicknesses between 50-200 nm) films can act as promising zones for the charge carrier diffusion before they reach the electrode and recombine. Plasma treatment can chemically modify the polymer layer, impacting the polymer film’s structure and perhaps hydrophilicity, leading to potential variations in polymer-metal intermixing as well as on the kinetics of metal nuclei formation and growth.
The aim of this master thesis is to explore for the first time how variable plasma etching conditions onto polysulfobetaine (or similar) thin films can affect the nanoscale morphology of different metals sputtered on top of the polysulfobetaine (or similar) thin film under vacuum conditions. The thesis’ deliverables can strongly reinforce design of novel unexplored organic solar cells.
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KTA, AEP |
Interferometric imaging with GRAVITY |
Eisenhauer |
- Research group
- Max-Planck-Institue for Extraterrestrial Physics (MPE)
- Description
GRAVITY [1] is a novel instrument which combines the light of four telescope at the ESO VLTI observatory. Employing the techniques of fringe tracking and phase referencing, it allows to measure complex visibilities at IR wavelengths and for imaging at unprecedented angular resolution in this part of the electromagnetic spectrum. Our group's particular interest is the use of GRAVITY for high-precision studies of the galactic center, where it has enabled several breakthrough discoveries [2]. To cope with the data complexity, we are developing a novel imaging code, based on the framework of Information Field Theory [3], which is written in python and based on the NIFTy [4] package. The goal of this master project is to investigate instrumental systematics, their impact on image reconstruction and to implement a model or correction. Eventually, a better description of the instrument will push the sensitivity towards fainter objects and allow to study Sagittarius A*, the radio source associated with the massive black hole in the center of the Milky Way, in greater detail.
Contact: Dr. Julia Stadler <jstadler@mpe.mpg.de>
[1] GRAVITY collaboration, "First light for GRAVITY: Phase referencing optical interferometry for the Very Large Telescope Interferometer", Astronomy & Astrophysics, Volume 602, id.A94, 23 pp. [2] GRAVITY collaboration, "GRAVITY and the Galactic Center", ESO Messenger Vol. 178, 2019 [3] T. Enßlin, "Information Theory: Information Theory for Fields", Annalen der Physik, vol. 531, issue 3, p. 1970017 [4] P. Arras et al., " NIFTy5: Numerical Information Field Theory v5", Astrophysics Source Code Library, record ascl:1903.008
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BIO, AEP, TMP |
Interplay of mechanics and information processing in cell tissues |
Gerland |
- Research group
- Theory of Complex Bio-Systems
- Description
A common theme in developmental biology and useful feature for synthetic systems is the coupling of patterning processes (cell differentiation) with mechanical processes and cell growth and death. Understanding the interplay of these different processes is crucial to be able to explain development, as well as to manipulate pattern formation processes in synthetic systems. In this thesis, a well-known model of tissue dynamics will be implemented and coupled to intercellular signaling dynamics in order to answer questions about the stability and robustness of the pattern creation process and the role of initial and boundary conditions. Of particular interest will be the study of feedbacks between the ‘mechanics’ and the ‘information processing’ in these systems.
- Contact person
- Stephan Kremser
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KM, AEP, QST |
Kalibrierung von Frequenz und Nichtlinearität in einem Bose-Hubbard-System |
Gross |
- Research group
- Technical Physics
- Description
-
Bose-Hubbard systems offer an intriguing opportunity of studying quantum driven-dissipative dynamics. Nowadays, these systems can be conveniently implemented by combining superconducting resonators with Josephson junctions. In order to successfully measure nonclassical effects in these systems, such as generation of antibunched light, one needs to accurately quantify their respective frequency range and nonlinearity strength. This goal can be achieved by cryogenic microwave measurements of a Bose-Hubbard dimer with superconducting quantum circuits and numerical modelling of the respective Hamiltonian. These two steps comprise the main body of the current master project. The successful project will potentially lead to a development of robust single-photon microwave sources and further exploration of quantum matter in the form of networks of nonlinear superconducting resonators.
- Contact person
- Frank Deppe
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KM, KTA, AEP, QST |
Kernspintomografie auf der Mikrometer-Skala (topic is not available any more) |
Reinhard |
- Research group
- Semiconductor Nanostructures and Quantum Systems
- Description
Magnetic resonance imaging (NMR/MRI), is one of the most powerful techniques to record three-dimensional images of nearly arbitrary samples. Current devices, such as those found in hospitals, cannot record details smaller than 1mm.
Our group aims to push MRI to a microscopy technique by improving its spatial resolution down to the sub-nm range, the scale of single atoms. This ambitious goal has recently become a realistic prospect by a new generation of quantum sensors for magnetic fields. They are based on the nitrogen-vacancy (NV) color defect in diamond and could detect fields as small as the NMR signal of a single molecule [1,2].
We are looking for a MSc student to develop a slightly different application: chip-scale NMR spectrometers for magnetic resonance imaging with a spatial resolution in the micrometer range.
Techniques:
* You will learn to fabricate microscale electromagnets in one of our clean rooms, and optimize our fabrication techniques for your project and others.
* You will design and fabricate a sensor chip for nanoscale magnetic resonance imaging
* You will redesign an existing microscope setup to apply strong magnetic fields and perform advanced imaging
* You will perform experiments to record microscale MRI images.
[1] T. Staudacher et al., Science 339, 561 (2013)
[2] H.J. Mamin et al., Science 339, 557 (2013)
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KM, AEP, QST |
Langlebiger supraleitender Quantenspeicher in Hufeisengeometrie |
Deppe |
- Research group
- Technical Physics
- Description
Long-lived and easy-to-address quantum memories are essential elements in quantum computing and quantum communication. At the WMI, we have recently built such a device in a compact form by placing a superconducting transmon qubit inside a high-quality 3D cavity resonator (E. Xie et al., Appl. Phys. Lett. 112, 202601, 2018, https://arxiv.org/abs/1803.04711). In addition, we have started to investigate potentialy advantageous cavity geometries. In your thesis, you investigate and improve the memory life time based such a novel cavity design and attempt optimal control strategies for improved memory process fidelities. |
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BSC, KM, KTA, AEP |
LEGEND: Are neutrinos their own anti-particles? |
Schönert |
- Research group
- Experimental Astro-Particle Physics
- Description
Neutrinos were discovered in 1956, but only at the turn of the millennium was it experimentally proven that the three known neutrino types can convert into one another. These flavor oscillations are possible only if neutrinos have nonzero mass, which is currently the only established contradiction to the standard model (SM) of particle physics. From tritium beta decay experiments and cosmological observations, we know that their masses are very small—less than 10-5 of the electron mass. Neutrinos are the only fundamental spin-1/2 particles (fermions) without electric charge. As a consequence, they might be Majorana fermions, particles identical to their antiparticles. This is a key ingredient of some explanations for why matter is so much more abundant than antimatter in today’s Universe and why neutrinos are so much lighter than the other elementary particles. Majorana neutrinos would lead to nuclear decays that violate lepton number conservation and are therefore forbidden in the Standard Model of particle physics. The so-called neutrinoless double-b (0nbb) decay simultaneously transforms two neutrons inside a nucleus into two protons with the emission of two electrons. The GERDA experiment and future LEGEND-200 experiment are located in the Italian Gran Sasso underground laboratory and are leading experiments in the world-wide competition.
We offer the opportunity to carry out exciting experimental BSc and MSc theses with a focus on liquid argon detector developments, germanium detector developments, data analysis and/or Monte Carlo simulations. You would be fully integrated into the research team and work closely together with our international partners.
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BSC, KM, KTA, AEP |
LEGEND: boost the scintillation light in liquid argon (topic is not available any more) |
Schönert |
- Research group
- Experimental Astro-Particle Physics
- Description
The scintillation light of argon peaks at 128 nm. Even minute impurity concentration at the ppm level can absorb these photons after few tenths of centimeters. The topic of this master thesis is to find efficient ways how to remove these impurities and/or to shift the wavelength instantaneously such that a much larger wavelength can be achieved. The overall goal is to improve the performance of the liquid argon detection system in LEGEND such that we can search for the neutrinoless double beta decay with unprecedented sensitivity.
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BSC, KM, KTA |
LEGEND: Deciphering the signal structure of novel germanium detectors |
Schönert |
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KTA |
Lepton number violating interactions as a guiding principle for the neutrino nature |
Harz |
- Research group
- Theoretical Physics of the Early Universe
- Description
-
Even though we know that neutrinos must have masses, we do not know yet which mechanism generates them. One possibility is that they are their own antiparticles, being of “Majorana” type. An experimental hint for this would be the measurement of lepton number violating interactions e.g. at the LHC, neutrinoless double beta decay or meson decays. In an effective field theory, we want to study the complemenatry of these interactions and their experimental prospects in more detail.
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KM, KTA, BIO, AEP, BEMP |
Machine Learning (AI)-based denoising of limited angle, sparse sampling CT post-processing for head and chest CT applications |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will focus on the potential usage of AI-based CT denoising methods (i.e. convolutional neural networks) for post-processing of CT scans aquired with a reduced number of projections in head or chest CT applications. The project will be carried out in close collaboration with the Department of Radiology at the TUM Klinikum Rechts der Isar and an external industrial collaborator.
Character of thesis work: mainly computational physics & image processing
For more information, please contact: Manuel Schultheiss (manuel.schultheiss@tum.de), Tobias Lasser (tobias.lasser@tum.de), or Franz Pfeiffer (franz.pfeiffer@tum.de).
- Contact person
- Manuel Schultheiß
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KM, KTA, BIO, AEP |
Material decomposition using spectral dark-field imaging (topic is not available any more) |
Herzen |
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BSC, AEP |
Mechanische Deformierbarkeit von DNA und Erkennung durch Proteine |
Zacharias |
- Research group
- Molecular Dynamics
- Description
- Wie Protein an bestimmten Stellen entlang DNA spezifisch binden, ist noch nicht gut verstanden. In vielen Fällen scheint die mechanische Deformierbarkeit eine große Rolle zu spielen. Molekulardynamische Simulationen sollen eingesetzt werden, um den Beitrag der DNA-Flexibilität und Deformierbarkeit bei der Erkennung durch Proteine besser zu verstehen. Die Simulationen erlauben thermodynamische Beiträge, wie z.B. die freie Energie der DNA-Deformation, zu quantifizieren und ihren Beitrag an Modellsystemen zu analysieren.
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BSC, KTA |
Modernes Rechnen, Statistik und Maschinelles Lernen |
Caldwell |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
- You will develop novel algorithms in the context of the Bayesian Analysis Toolkit. Possibilities include implementing a Nested Sampling algorithm, developing highly parallelized versions of Markov Chain Monte Carlo algorithms, developing novel test statistics for rare event searches, etc. The specific topic will be decided based on the background and interests of the student.
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KTA |
Neuronale Netze in Gamma Spektren |
Petry |
- Research group
- Functional Materials
- Description
- The proposed M.Sc. thesis aims to bring the evaluation of gamma spectra an important step forward by
- Thorough check of the quality of the available training data
- Set up of a suitable neural network to reliably identify nuclides in unassigned gamma spectra
- Identification of influences of different gamma detectors on the nuclide assignment
- Contact person
- Winfried Petry
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KM, AEP |
Nonlinear Laser fault injection in semiconductor devices (topic is not available any more) |
Kienberger |
- Research group
- Laser and X-Ray Physics
- Description
Fault Injection through Laser irradiation is an established attack method in the context of hardwarebased IT-security. Faulty data can be exploited in various ways to break the security measures of an Integrated Circuit. These techniques are referred to as “Fault Attacks”. This project will address fault injection employing a state of the art ultra-short pulse laser system. With semiconductors being inherently sensitive to light, it is feasible to induce transient currents in a chip by irradiation. The goal is to optimize the light source taking into account nonlinear optics to utilize the dominant physics in the best possible way.
The thesis is performed in cooperation with the Fraunhofer Research Institution for Applied and Integrated Security (AISEC) and comprises the following tasks:
Development of a laser workbench including IR generation.
Systematic studies of the laser source (focusing, wavelength, pulse duration . . . ).
Study of the fault injection on a model system.
- Contact person
- Andreas Duensing
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KM, AEP |
Novel measurement setup to investigate thermoelectric materials |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
Organic thermoelectric (TE) materials are nowadays an increasingly emerging topic of research, as they are useful in TE generators to directly convert a temperature gradient into electrical energy. Therefore they are of immense environmental interest in terms of waste heat recovery and the use of solar thermal energy. Recent research has shown that the performance of organic TE materials, especially PEDOT:PSS is strongly dependent on the relative humidity. In this master thesis a new measurement setup will be designed and built, which allows us to investigate TE properties like Seebeck coefficient and electrical conductivity under controlled relative humidity. This setup would give us a huge advantage to better understand the effect of humidity on organic thermoelectric films and to use this knowledge for improving the performance of TE materials. The project will involve a literature review, the development and construction of the new measurement setup to fit the requirements, and in the end the fabrication of organic TE films in the laboratory to test the novel self-made setup.
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KM, AEP |
Novel nanostructured thermoelectric hybrid materials |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
In this project, we aim to fabricate and investigate novel organic-inorganic hybrid materials for thermoelectric applications. The goal is to realize efficient low temperature (T < 100°C) thermoelectric thin films and coatings which can contribute for example to energy efficient buildings. By combining nanostructured inorganic materials with conducting polymers a novel approach for this class of materials shall be realized. Possible inorganic nanomaterial components include Silicon nanocrystals (either undoped, n-type or p-type doped) as well as other nanoparticles. Different polymer materials such as the polymer blends of conjugated polymers, which can be tuned in conductivity and in its nanostructure, shall be used as the organic partner in our hybrid approach.
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BSC, KM, AEP |
Novel Nanowire Devices for the Optoelectronic Control of Color Centers in Silicon Carbide (topic is not available any more) |
Stutzmann |
- Research group
- Experimental Semiconductor Physics
- Description
- Group III-nitride nanowires (NWs), namely GaN and its ternary alloys InxGa1-xN and AlxGa1-xN, have attracted increasing interest in device fabrication. Due to their 1D geometry and their high refractive index compared to air, the NWs are suitable as optical waveguides, especially for materials with a comparable refractive index like diamond or silicon carbide (SiC). The color center of these materials, e.g. nitrogen vacancies NV in diamond and silicon vacancies VSi in SiC, are both promising candidates as qubits for quantum computational applications. In detail, the NWs should work as nano-antenna for the optical read-out of the color centers and as nano-contacts for the electrical control of the charge states of the color centers.
The aim of this work is the fabrication and characterization of (In,Ga)N NW LEDs for the optoelectronic control of VSi in SiC.
- Contact person
- Theresa Hoffmann
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KM, AEP |
Novel pathways to hybrid solar cells |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
Hybrid solar cells combine an inorganic and an organic component into a photovoltaic cell. They combine the advantages of inorganic materials (e.g. metal oxides: TiO2 or GeO) such as high charge carrier mobility and very high stability with those of organic materials (e.g. conducting polymers: PTB7) such as cost-effectiveness and flexibility. In comparison with standard silicon solar cells, the hybrid solar cells can be easily manufactured and can allow for alternative processing techniques as for example spray-coating and printing. In contrast to dye sensitized solar cells (DSSCs), hybrid solar cell devices contain no dye as active components and consequently problems such as photo-bleaching are mitigated. Moreover, all materials in the hybrid solar cells are solid and thus no sealing to protect against leakage of aggressive solvents such as in DSSCs is required. Regarding application, the hybrid solar cells are more environmentally friendly. Compared to organic solar cells, which are composed purely out of organic components, hybrid solar cells are expected to have higher lifetime stability. In particular, a degradation of the morphology, which is one pathway in organic solar cell degradation, cannot happen in the hybrid solar cells. The inorganic component acts as a corset to the morphology and prevents structural changes. Despite all these advantages of hybrid solar cells, so far most research on alternative solar cells beyond the silicon solar cells, has been focused on DSSCs and organic solar cells. hybrid solar cells have gained much less attention and therefore have a high undiscovered potential, which will be investigated in the present thesis based on novel pathways.
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KM, KTA, BIO, AEP, BEMP |
Optimierung von Dual Energy CT in der Kleintier-Computertomographie am MRI (topic is not available any more) |
Wilkens |
- Research group
- Associate Professorship of Medical Radiation Physics (Prof. Wilkens)
- Description
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Introduction:
Computed tomography is a three-dimensional imaging method in which X-rays can be used to calculate slices of an object. Dual Energy CT uses the energy dependence of X-rays: The respective object is measured with different X-ray spectra, and the images obtained are subsequently processed and reconstructed. With the help of different algorithms, Dual Energy CT can extract much more information from the image than conventional imaging (monoenergetic images, electron density, material images, ...). Dual Energy CT devices are in use in human medicine since a few years; in this work the method is used on a small animal irradiation device for mice. Our dual energy method uses a calibration using calibration cylinders and two different X-ray spectra.
Tasks:
The master thesis focuses on the optimization of X-ray spectra and calibration and its effect on the measurement. When choosing the X-ray spectra, many combinations are possible by using different voltages and filters. The optimal combinations should be found by using different criteria and verified with a phantom. The calibration cylinders should be examined and improved with regard to their geometry and material. It should also be considered whether different calibration phantoms are advantageous for different measurement objects. Furthermore, it should be checked how stable the calibration is depending on the position in the device and the time. In all optimizations, the focus is on ensuring that the subsequent measurement of the object provides the most accurate possible result.
Requirements:
You are interested in medical physics, especially in X-ray diagnostics/radiotherapy?
You like to work experimentally and can imagine working in a clean room?
You have basic experience with Python and enjoy programming?
Contact:
Manuela Duda
manuela.duda@tum.de
Medical Radiation Physics / Prof. Wilkens
Klinikum rechts der Isar (MRI)
- Contact person
- Manuela Duda
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KM, AEP |
Optomechanics of coupled micro-drums |
Poot |
- Research group
- Quantum Technologies
- Description
- In this project you will dive into the interesting field of cavity optomechanics. We create micrometer-scale mechanical devices made from silicon nitride using advanced nanofabrication techniques here on campus: imagine a drum, but now more than 10 000x smaller! So small that it can be played ustilizing the momentum of photons, the so-called radiation pressure. You will also use light to extract information about mechanical properies - like their quality factors and resonance frequencies and even see their eigenmodes. What happens to these properties when many of the drums are coupled? That will be the key question of your project.
We apply a novel technique to perform usually very long measurements on rather short time scales. We already have some working samples, so you can directly start and go ahead with the measurements. But you will also have the chance to learn many aspects of nanofabrication and make your own devices in the cleanroom, then measure them, and analyze the data.
- Contact person
- David Hoch
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KM, AEP, QST |
Optomechanics with Single Photons |
Poot |
- Research group
- Quantum Technologies
- Description
In optomechanics, light is used to measure and alter the dynamics of mechanical resonators. It is by far the most sensitive method to observe the tiny vibrations that nanomechanical devices perform: in one second one can determine their position with femtometer precision! Using light to measure the mechanics is not the only aspect of optomechanics. The same light can also be used to change the dynamics of the mechanical device through a process called cavity backaction. The photons exert a force on the resonator, the so-called radiation pressure. In this project we want to explore the ultimate limits to this force. The goal is to measure the force originating from a single photon! For this it is required that the photon interacts with the mechanical resonator as strongly as possible. For this we need to the design and make very low loss optical cavities, such as microring resonators. Also, the mechanical device should have a quality factor as high as possible. You will make both the optical and mechanical components from chips with highly-stressed silicon nitride using state-of-the-art nanofabrication in the cleanroom. Then the devices are placed in a vacuum chamber for their measurement. In our highly-automated setup you can very quickly characterize many of the devices on your chip. Then, with the perfect device parameters you can start to explore the more advanced measurements. Initially we can measure the devices in with pulsed light, but by using single photons we want to explore the ultimate limits to optomechanical forces.
See http://www.groups.ph.tum.de/en/qtech/openings/ for a detailed description of this project.
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KM, AEP, QST |
Oxidische Heterostrukturen für Experimente mit reinen Spinströmen (topic is not available any more) |
Gross |
- Research group
- Technical Physics
- Description
Pure spin currents are generated and/or detected via the spin Hall and inverse spin Hall effect in heavy metals. These two effects crucially depend on the magnitude of the spin-orbit interaction. The goal of this thesis is to investigate the spin Hall physics in oxide systems, where large spin orbit interaction is prevailing like in the transition metal oxides. In particular, the realization of epitaxial multilayers of a spin Hall active material and a magnetically ordered insulator are a major task of this research project. Such all-oxide epitaxial structures are of current interest to better understand the underlying physics of pure spin current transport in heterostructures.
We are looking for an enthusiastic master student to work on this pure spin current physics related project. A crucial part of the thesis is the growth of oxide multilayers using laser-MBE under in-situ growth monitoring. The properties of these multilayers will then be investigated by structural, magnetic and magnetotransport techniques. As a next step, the tunability of relevant spin transport properties via the growth conditions will be analyzed
- Contact person
- Stephan Geprägs
- Matthias Opel
- Matthias Althammer
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KM, AEP |
pH-responsive Polymermizellen für den Wirkstofftransport |
Papadakis |
- Research group
- Soft Matter Physics
- Description
- In aqueous solution, amphiphilic block copolymers form core-shell micelles with the hydrophobic blocks forming the core and the hydrophilic blocks the shell. Such micelles find numerous applications for uptake, transport and release of hydrophobic substances. “Smart” systems may be created if the shell-forming block is pH-responsive, i.e. its degree of charge is controlled by pH. These can be used for the delivery of DNA.
In the proposed master thesis, triblock terpolymers featuring a hydrophobic, a pH-responsive and a water-soluble block shall be studied using fluorescence correlation spectroscopy, dynamic light scattering and small-angle X-ray or neutron scattering. The candidate should be interested in experimental work as well as in data analysis and molecular interpretation.
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KM, KTA, BIO, AEP, BEMP |
Pre-clinical evaluation of spectral photon-counting detectors for chest X-ray cancer and tuberculosis screening |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will explore the use of latest hybrid-pixel photon-counting detectors for improving the diagnostic accuracy of chest X-ray examinations. More specifically, this work will use dedicated phantoms for assessing the potential clinical benefit of photon-counting-based material decomposition algorithms for better lung cancer and tuberculosis detection. The project will be carried out in close collaboration with the Department of Radiology at the TUM Klinikum Rechts der Isar.
Character of thesis work: experimental physics (50%) & image processing (50%)
For more information, please contact: Thorsten Sellerer (thorsten.sellerer@tum.de), Franz Pfeiffer (franz.pfeiffer@tum.de)
- Contact person
- Thorsten Sellerer
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KM, AEP |
Printed polymer-based thin film batteries |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
Materials for high energy density, solid-state batteries have been tremendously explored in the last decade. In particular, lithium-ion technology has attracted major interest. Among the many different types of batteries, the so-called polymer-based thin film batteries are very attractive as they can be incorporated into thin film devices. An inherent important part of such thin film lithium ion batteries is the membrane and solid-state polymer electrolyte membranes have attracted high attention in this respect. Lithium ions’ incorporation into solid-state polymer electrolyte membranes had shown a significant effect on both, the structure and properties, of the membranes in either the bulk or film format. The morphological reorganization and the thermodynamic properties of the solid-state polymer electrolyte membrane upon adding lithium salts and small molecules are the subjects of the experimental investigation. The polymer membranes will be prepared with printing. The structure and crystallinity of the lithium-doped membranes at different temperatures will be investigated with small/wide-angle X-ray scattering (SAXS/WAXS). The effects of morphology on the ionic conductivity of these ion-conducting membranes will be investigated using impedance spectroscopy. Aim of the present study is to increase conductivity with the help of small molecule additives, which can further improve the membrane morphology beyond the possibilities of the standard approach. Such high conductivity will be very beneficial for further downsizing of polymer-based thin film batteries.
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KM, AEP |
Proteinbasierte Nanoteilchen für den Wirkstofftransport |
Papadakis |
- Research group
- Soft Matter Physics
- Description
- Protein-based nanocarriers are of great interest for the encapsulation and release of hydrophobic bioactive substances, e.g. medical drugs, upon application of stimuli, such as ionic strength and pH. Such nanoparticles may be prepared from proteins and polyelectrolytes that form complexes by electrostatic interactions. By subsequent heating, the disulfide bonds between the proteins within the nanoparticles are stabilized. This preparation method yields robust nanoparticles that can swell or deswell upon changes of pH and ionic strength and retain the multifunctionality of the incorporated proteins.
In the project proposed, the nanoparticles shall be characterized in terms of their size and internal morphology in dependence on the building blocks and upon change of pH or ionic strength. At this, a combination of fluorescence correlation spectroscopy, light scattering and small-angle X-ray scattering (SAXS) will be used. The candidate should be interested in experimental work as well as in data analysis and molecular interpretation.
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BSC, KM, KTA, QST |
Qualifizierung von Piezo Motoren by kryogenen Temperaturen für das MADMAX Experiment zur Suche nach dunkle Materie Axionen |
Majorovits |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
Für den Betrieb des MADMAX Experimentes wurden Piezo Motoren entwickelt, die bei kryogenen Temperaturen (4 K) funktionieren und einen Hub von bis zu 1 m haben. Die ersten gelieferten Prototypmotoren müssen bei kryogenen Temperaturen getestet und auf verschiedene Betriebsparameter untersucht werden. Qualification of Piezo motors at cryogenic temperatures for the MADMAX axion dark matter experiment In the context of the MADMAX dark matter axion search experiment Piezo motors have been developed for operation at cryogenic temperatures (4 K) for a stroke of up to 1 m. The first prototype motors that have been delivered will need to be tested at cyrogenic temperatures and several parameters need to be investigated.
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KM, KTA, BIO, AEP, BEMP |
Quantitative phase-contrast imaging at highly brillant X-ray sources |
Herzen |
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KM, KTA, BIO, AEP, BEMP |
Quantitative X-ray dark-field imaging |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will focus on methods to extract quantitative structural parameters from grating-based X-ray dark-field imaging that enable hardware independent studies in medical and material science applications.
The project will mainly involve experimental (laboratory) work, and image processing (primarily in Python).
Character of thesis work: experimental physics (50%) & image processing (50%)
For more information, please contact: Florian Schaff (florian.schaff@tum.de) or Franz Pfeiffer (franz.pfeiffer@tum.de)
- Contact person
- Florian Schaff
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KM, AEP, QST |
Quantum Optics on a Chip |
Poot |
- Research group
- Quantum Technologies
- Description
Quantum optics is an extremely powerful approach towards quantum communication, quantum sensing, and quantum computing. In particular, quantum information stored in photons has very low decoherence and can be transmitted over large distances through optical fibers. To date, most experiments in quantum optics use optical tables full with mirrors and beam splitters that all have to be carefully aligned and stabilized. This may be good enough for initial demonstrations, but in order to bring quantum science into the realm of quantum technology, a more scalable approach is required.
With our expertise in making photonic chips using advanced nanofabrication, we are making putting these exciting quantum optics experiments on chips. Here, light is routed via optical waveguides. Furthermore, by bending a waveguide, one gets the equivalent of a free-space mirror; a beam splitter cube becomes a directional coupler and so on. By combining these elements, we can make the building block for e.g. an optical quantum computer. With that, the possibilities are almost unlimited.
For such large-scale optical quantum circuits we also want to incorporate single-photon sources, superconducting single-photon detectors, and optomechanical phase shifters. This all happens on a single chip. Making and characterizing the components is the first step and from there on, you are making more and more complex quantum chips. You will be doing the nanofabrication in the cleanroom, and then use our optical measurement setups to see how each device is performing. Depending on your preference, it may also be possible to add a modelling component to the project.
See http://www.groups.ph.tum.de/en/qtech/openings/ for a detailed description of this project.
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KM, KTA, BIO, AEP, BEMP |
Rapid kV-switiching K-edge imaging with a compact synchrotron source (topic is not available any more) |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will focus on the development of an experimental scheme for rapid kV-switching with a compact synchrotron source. Subsequent to the implementation, first application experiments around the K-edges of suitable contrast agent in biomedical samples shall be performed.
Character of thesis work: mainly experimental physics
For more information, please contact: Martin Dierolf (martin.dierolf@tum.de) or Franz Pfeiffer (franz.pfeiffer@tum.de).
- Contact person
- Martin Dierolf
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BSC, BIO, BEMP |
Rekonstitution von aktiven Zytoskelettsystemen |
Bausch |
- Research group
- Cellular Biophysics
- Description
Das zytoskelett ist ein aktives Polymernetzwerk innerhalb von jeder eukaryontischen Zelle. Die Aktivität diesesNetzwerks ermöglichen alle lebensnotwendigen Prozesse von Zellen - von der Zellteilung, Zellbewegung bis hin zum Zelltod. Im Rahmender Arbeit sollen einzelne Komponenten in vitro rekonstruiert werden und deren Dynamik quantifiziert werden. Ziel ist es eine Art künstliche Zellen zu bauen, um die biologischen Prozesse besser verstehen zu können. Zum Einsatz kommen eine Reih von hochauflösenden Mikroskopiemethoden, Bildverarbeitung und biochemische Technologien.
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BSC, KTA, AEP |
Search for high energy neutrino emission from blazars: stacking gamma-ray bright sources. |
Resconi |
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KTA |
Sehr Lange Basislinie Neutrino-Oszillation Analyse in KamLAND (topic is not available any more) |
Schönert |
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BSC, BIO, AEP, BEMP |
Selbstorganisationsprozesse bei der Organbildung |
Bausch |
- Research group
- Cellular Biophysics
- Description
Wie entstehen Organe? Welches physikalischen Konzepte beschreiben die Zellbewegungen, die ultimativ zu der Formierung von verschiedensten Geometrien führen?
Es ist seit Neuestem möglich, Mini-Organe im Labor wachsen zu lassen. Einzelne Zellen werden in ein 3D Zellkultur eingebettet, und aus dieser entstehet dann ganz von selber ein kleiner Pankreas oder Brustdrüsen. Diese Systeme eröffnen die einzigartige Möglichkeit den Wachstumsprozess direkt zu beobachte, aber auch gleichzeitig fehlgeleitete Prozesse in Krankheiten zu untersuchen. Ultimativ dienen diese Organoidsysteme für die Entwicklung von personlasieriten Medikamenten.
Im Rahmen der Arbeit soll die Zellbewegung in den Epithelzelllagen bestimmt werden. KI Technoligien werden dabei eingesetzt, um die komplexen 3D Bewegungen zu analysieren. Es soll herausgefunden werden, ob die kollektive Bewegungen der Zellen anhand von einer Navier-Stokes Gleichung für aktive Fluide beschrieben werden kann.
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KM, AEP |
Self organization routes for nanostructuring hybrid perovskites toward high efficiency photovoltaics |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
Nanostructuring of thin films has been utilized as a method for light trapping and enhancing the optical path-length of photons within the absorbing material. Structured surfaces utilize geometries to enforce such routes, which are commonly attained by energy, cost-extensive techniques such as lithography, plasmon resonance. Hybrid perovskites are solution processable materials that exhibit efficiencies competitive with the state-of-the-art silicon solar cells, at significantly lower costs. The precursors exhibit colloidal nature, which makes it possible to tune thin film morphologies by controlling the chemical nature of these precursors by harnessing self-assembly behaviour in drying colloidal dispersions.
Mixed hybrid perovskite thin films will be prepared from colloidal solutions. The solution will be characterized by SAXS, DLS, UV-Vis. Interaction of the solution with substrates will be studied by means of contact angle measurements. Thin films prepared from colloidal dispersions will be characterized by XRD, SEM, AFM, UV-Vis. Solar cells will be prepared and characterized for their photovoltaic response.
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KTA |
Simulation and analysis of backgrounds for the Solar Axion Experiment IAXO |
Mertens |
- Research group
- Dark Matter
- Description
Scientific motivation:
Axions are a well motivated explanation for the strong CP problem. They are also one of the most promising Dark Matter candidate. The IAXO experiment is exploring a unique phase space to look for this particle emitted by the Sun. A very intense magnetic field would transform these solar axions into few keV x-rays. Silicon Drift Detectors (SDD) are a very suitable candidate for x-ray detection. The background of such a detector is the only limiting factor. Therefore it should be correctly measured, understood and mitigated.
Thesis Topics:
The thesis would focus on measuring with the existing set-up located at the TUM UGL the SDD intrinsic background as well as to model its provenance. Then depending on this result, work would be to design a new detector/set-up to reach the final IAXO requirements.
You will gain & learn:
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Learn about astroparticle physics
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Detailed understanding of semiconductor detector technology
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Expertise in experimental hardware work and simulations
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Programming in Python and C++
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Low background in the keV regime
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Work in a fun team with lots of social events
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BSC, KM, AEP, QST |
Simulation und Aufbau einer Überhöhungskavität für hohe optische Leistungen |
Kienberger |
- Research group
- Laser and X-Ray Physics
- Description
- (English see below)
Hast Du Dich schon mal gefragt, was passieren würde, wenn man einen Lichtpuls zwischen zwei Spiegeln einfängt? Genau das wollen wir versuchen und damit die Grenzen der Physik im Bereich der hohen Laserleistungen ausloten. Ziel des Projektes ist eine Verbesserung von MuCLS, einer kompakten, aber brillanten Lichtquelle. Diese liefert Röntgenpulse durch inverse Comptonstreuung von Elektronen an Laserpulsen. Um die Intensität, die Wellenlänge und allgemeine Einsatzmöglichkeiten der Lichtquelle zu erweitern, beschäftigen wir uns mit einem Upgrade der Überhöhungskavität.
Aktuell sind wir dabei das Design des experimentellen Aufbaus zu finalisieren. Deine Aufgabe wird es sein, mit uns das Konzept umzusetzen. Das beinhaltet das Setup aufzubauen und zu testen. Gleichzeitig werden Simulationen durchgeführt werden, zum Beispiel um den Einfluss der Krümmungsradien der Spiegel besser zu verstehen. Die Ergebnisse werden direkt auf die Verbesserung des Aufbaus übertragen. Schlussendlich erhoffen wir uns das erste Mal eine Finesse von 30.000 in der grünen Überhöhungskavität zeigen zu können.
Alles Weitere erfährst Du bei einem persönlichen Gespräch.
*************************************************************
Have you ever asked yourself what would happen if you trap a pulse of light in between two mirrors? This is exactly what we are planning to do and thereby determine the boundaries of high-power laserphysics. The project as a whole is embedded in the frame of MuCLS, a compact but brilliant light source. This light source generates X-ray pulses by inverse Compton scattering of electron on a laser pulse. Upgrading the intensity, wavelength and overall quality of the laser pulse is the goal here in order to extend the range of applications.
Currently, we are finalizing the design of the overall experimental setup. Your task would be to support us in transforming the concept into reality. This includes building the setup and testing it. Meanwhile some simulations on different parameters such as the radius of curvature of the mirrors will have to be performed. The results will directly influence and improve the setup. In the end, we hope to show a finesse of 30.000 in the laser cavity.
If you are interested, feel free to get in touch.
- Contact person
- Albert Schletter
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KM, AEP |
Smart nano-sensors made of stimuli-responsive polymers in solution and in thin films |
Müller-Buschbaum |
- Research group
- Functional Materials
- Description
Whereas macroscopic sensors made of stimuli-responsive hydrogels are well established, in the nanoworld such sensors still face many challenges. Potential fields of application of such sensors extend from engineering to bioengineering and medicine, e.g. as nanosensors for the control of concentration of glucose for diabetes patients or as switchable surface in the frame of tissue engineering. In this experimental project smart hydrogels, made of stimuli-responsive hydrogels will be investigated. Hydrogel films with thicknesses of a few tens to some hundreds of nanometers and spontaneously deswell or swell due to external stimuli, like temperature or the concentrations of ions. The changes in thickness and in molecular interactions in swelling or collapsing hydrogels will be probed during the switching process by different lab-based techniques. A comprehensive understanding of the switching process can be achieved by complementary neutron scattering experiments at large scale facilities. The project will involve a literature review, preparation of hydrogels, as well as experimental investigations and interpretations of the repeated switching of the stimuli-responsive hydrogels.
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KM, BIO, AEP, M2L, TMP |
Smoke in a white smoker |
Alim |
- Research group
- Theory of Biological Networks
- Description
White smokers are likely the cradle of life. Their pores and tunnels allow for pockets of catalytic sites that fuel reactions at the very origin of life. How do these catalytic sites form and grow with the smoker? You will map out the structure of two-dimensional smoker models generated in William Orsi’s lab at LMU. You will then use your maps to simulate the flow and transport of reactants with the flow through the smoker. Methods: Matlab, Image Analysis, Statistical Physics, Stochastic Processes, Fluid Physics. Prerequisites: Statistical Physics and fascination for the marvels of nature.
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KM, AEP |
Sodium Ion Batteries |
Bandarenka |
- Research group
- Physics of Energy Conversion and Storage
- Description
Energy storage technologies are an indispensable element of the transition towards an eco-friendly society. Due to their low cost, scalability and non-flammability, rechargeable aqueous sodium ion batteries are a promising candidate for stationary applications, ranging from photovoltaic-powered private households to large scale grid power buffers. This experimental master thesis project will aim at understanding, characterizing and optimizing intercalation-type battery electrodes. The student will contribute to the ongoing investigation of fabrication methods, electrolyte composition, electrode substrates, active material composition and full-system prototyping, as well as performance characteristics like self-discharge and lifetime. The project will involve experimental training in a physico-chemical laboratory and hands-on working on battery systems, thereby conveying standard fabrication and characterization methods, especially in the field of energy materials.
- Contact person
- Aliaksandr Bandarenka
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KM, AEP, QST |
Spectroscopy on atomically thin materials in high pulsed magnetic fields |
Finley |
- Research group
- Semiconductor Nanostructures and Quantum Systems
- Description
The field of van der Waals heterostructures, which are stacks on individual atomically thin crystal sheets, has exploded in the last decade. Comparable to a game of Nano-Lego, those van der Waals stacks can be assembled in such a way that yield electro-optical nano-devices with essentially unlimited functionalities. Further, clever stacking can also result in new, fundamental physics.
The principal goal of this Masters's thesis is to study the optical properties of actively tunable van der Waals heterostructures to examine topics such as exciton localization, many-body physics, exciton- exciton interactions, or the impact of complex dielectric environments on exciton properties in high to ultra-high magnetic fields.
During the project you will work in close collaboration with a small team of Ph.D. students and postdocs, therefore individual effort is key to drive this Masters's project.
Some knowledge in the areas of van der Waals stacking, optics, or cleanroom fabrication will be beneficial, but secondary to your personal motivation and commitment to this project.
You should:
(1) Be highly motivated and self-driven, (2) be practically minded with a get-things-done attitude, (3) enjoy working across a wide range of tasks (processing, optics), and (4) be willing to work in a very small team on challenging things very long hours ...
You will get:
(1) the chance to work on current hot-topic issues in the area of 2D van der Waals physics (2) exposure to experiments in large scale magnetic field facilities (3) a sound understanding of the physics in atomically thin materials and hopefully (4) a few nice papers.
- Contact person
- Andreas Stier
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KM, AEP, QST |
Spin-dynamics in magnetic 2D-materials |
Finley |
- Research group
- Semiconductor Nanostructures and Quantum Systems
- Description
The field of van der Waals heterostructures, which are stacks on individual atomically thin crystal sheets, has exploded in the last decade. Specifically, magnetic 2D materials or heterostructures between different 2D materials have shown great promise for future information technology.
The principal goal of this Masters's thesis is to (i) enhance a currently available quantum camera system to enable coherent spin control of atomically thin materials (ii) image the spin lifetime and coherence times of magnetic phases of novel 2D-materials.
During the project you will work in close collaboration with a small team of Ph.D. students and postdocs, therefore individual effort is key to drive this Masters's project.
Some knowledge in the areas of van der Waals stacking, optics, electronics, or cleanroom fabrication will be beneficial, but secondary to your personal motivation and commitment to this project.
You should:
(1) Be highly motivated and self-driven, (2) be practically minded with a get-things-done attitude, (3) enjoy working across a wide range of tasks (processing, optics, electronics), and (4) be willing to work in a very small team on challenging things very long hours ...
You will get:
(1) the chance to work on current hot-topic issues in the area of 2D magnetism (2) gain highly sought after abilities in the field of quantum technologies (3) a sound understanding of the physics in atomically thin materials and hopefully (4) a few nice papers.
- Contact person
- Andreas Stier
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KM, AEP, QST |
Strong electrostatic effects in optomechanical devices |
Poot |
- Research group
- Quantum Technologies
- Description
Optomechanics provides extremely sensitive methods to measure the displacement of mechanical resonators. However, the forces are much smaller in optomechanics compared to those in nanoelectromechanical systems (NEMS). The goal of the project is to make, and measure opto-electromechanical devices which have strong electrostatic interactions. This includes the electrostatic spring effect where the resonance frequency depends strongly on the applied voltage. The next step is trying to measure the potential by measuring the ringdown of different mechanical modes. The devices will be made using advanced nanofabrication techniques such as electron beam lithography and reactive ion etching.
See http://www.groups.ph.tum.de/en/qtech/openings/ for a detailed description of this project.
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KTA |
Studien zur Suche nach dem Protonzerfall im zukünftigen JUNO Experiment |
Oberauer |
- Research group
- Experimental Astro-Particle Physics
- Description
- Der sich im Aufbau befindliche JUNO Detektor hat neben der Neutrinophysik das Potential zur Suche nach dem Protonzerfall. In der Arbeit soll die Signatur solcher hypothetischen Ereignisse am Computer in Simulationen bestimmt und mit der von möglichen Hintergrundereignissen atmosphärischer Neutrinos verglichen werden, um so eine Strategie zur Suche nach dem Protonzerfall zu entwickeln. Aus den Resultaten der Simulationen sollen zudem die Rahmenbedingungen für Testexperimente am Beschleuniger bestimmt werden, mit denen die Signatur des Protonzerfalls experimentell bestimmt werden kann.
- Contact person
- Matthias Raphael Stock
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KTA |
Studying the chemical signature of protostellar binary interactions through simulations |
Eisenhauer |
- Research group
- Max-Planck-Institue for Extraterrestrial Physics (MPE)
- Description
More than half of the stars forms in multiple systems. The dynamical interactions between the multiple stars can have a profound influence on the formation and evolution of stars and planets. This, however, is not well understood, especially at the early stages of star formation, due to the difficulty of observing young stars obscured by its surrounding natal cloud. Recent high-resolution ALMA (the Atacama Large Millimeter/submillimeter Array) observations have spatially resolved the emission from complex organic molecules around a very young protostellar binary system [1], also constraining the stellar masses and orbital parameters. The emission from these molecules coincides with features seen in the dust around the binary accretion disks, possibly corresponding to spirals or tightly wound structures. These features are difficult to explain if the emission arises solely due to heating from the forming protostars, the most common scenario used to explain the appearance of warm complex organic molecule emission around protostars. We propose to investigate the role of shocks created by the binary interactions in the production and distribution of molecular tracers at scales from a few up to 100 astronomical units. Gravitational forces from the binary stars can create shocks in the disk surrounding them. Detailed numerical simulations will be needed to investigate the temperature and density structure created by the interaction. This study will shed light on how the binary interactions can influence the chemical inventory in multiple systems at planet formation scales. During this master project, the student will carry out 3D hydrodynamical simulations with the orbital and gas properties observed in the protostellar binary [2]. Detailed thermo-dynamics will be built to investigate the origin of the high temperature and density tracers seen in the gas phase towards this embedded binary system. The student will analyze the spirals or other types of shocks features formed in the simulations, and how it depends on the numerical and physical parameters.
Prerequisites: Basic knowledge in programming (C/C++ and Python will be used).
Contact: Dr. Munan Gong <munan@mpe.mpg.de>, Dr. Maria Jose Maureira <maureira@mpe.mpg.de>, Prof. Dr. Paola Caselli <caselli@mpe.mpg.de>
[1] Maureira et el. 2020, "Orbital and Mass Constraints of the Young Binary System IRAS 16293-2422 A". The Astrophysical Journal 897.
[2] Moody et al. 2019, "Hydrodynamic Torques in Circumbinary Accretion Disks", The Astrophysical Journal 875.
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KM, AEP, QST |
Study of the electromagnetically induced transparency in the rare-earth spin ensembles in the microwave regime |
Gross |
- Research group
- Technical Physics
- Description
- A reliable quantum memory system is being actively searched for among different types of solid-state systems. In particular, rare-earth doped spin ensembles, which possess favorable transitions in optical and microwave ranges, are promising candidates. The current project aims at developing a quantum
memory system based on rare-earth spin ensembles. Such quantum memory elements should work at zero magnetic field at ultra-low temperatures. The major task of this project is to implement the electromagnetically induced transparency, widely used in optics, into the microwave regime.
We are looking for a highly motivated master student joining this project. Within your thesis, you will couple the spin-ensembles to the superconducting transmission lines and will manipulate the spin-states with microwave pulses. You will learn about the nature of the electromagnetically induced transparency and its application in quantum memory. Within the project, you will get hands on experience in synthesizing microwave pulses; how to measure the time responses of the spin-systems and how to operate such systems at cryogenic temperatures.
- Contact person
- Nadezhda Kukharchyk
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BSC, KM |
Suche nach Anzeichen für neue Physik in den Kopplungen der Higgsbosons an die schwachen Eichbosonen mit den Daten des ATLAS-Experimentes |
Kortner |
- Research group
- Hadronic Structure and Fundamental Symmetries
- Description
Nach der Entdeckung des Higgsbosons am LHC im Jahre 2012 ist die Untersuchung der Eigenschaften des Higgsbosons in den Vordergrund gerückt. Viele Erweiterungen des Standardmodells sagen kleine Änderungen der Kopplungen des Higgsbosons an die schwachen Eichbosonen voraus. Das Studium der Raten der Produktion des Higgsbosons in Assoziation mit zwei Eichbosonen sowie die Untersuchung der Winkelverteilungen im Zerfall des Higgsbosons in zwei Z-Bosonen gestatten es, die Art und Größe der Abweichungen der Kopplungen von der Standardmodellvorhersage einzugrenzen.
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BSC, KTA |
Suche nach CP-Verletzung in Produktion und Zerfall des Higgs-Bosons mit dem ATLAS-Detektor am LHC |
Kroha |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
- Eine wichtige Quelle fuer die Verletzung der CP- und damit der Zeitumkehrsymmetrie koennte in den Produktions- und Zerfalls-mechanismen des Higgs-Bosons zu finden sein. Neue Quellen der CP-Verletzung werden dringend gesucht, um die Existenz von Materie im Universum zu erklaeren. Das ATLAS-Experiment am Large Hadron Collider am CERN bietet die einzigartige Moeglichkeit nach solchen Effekten zu suchen. Dazu werden bereits aufgenommene Daten und Simulationsrechnungen der relevanten Prozesse im ATLAS-Detektor verwendet.
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BSC, KTA |
Suche nach doppelt geladenen Higgs-Bosonen mit dem ATLAS- Detector am LHC |
Kroha |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
- Doppelt geladene Higgs-Bosonen sind ein eindeutiges Kennzeichen von Erweiterungen des Standardmodells der Teilchenphysik. Elementaren Teilchen mit doppelter wurden bisher noch nicht beobachtet. Die Experimente am LHC bieten die einzige Moeglichkeit nach solchen Teilchen in verschiedenen Produktions- und Zerfallskanaelen zu suchen. Dazu koennen vorhandene Daten des ATLAS-EXperiments im Rahmen von Bachelor- und Masterarbeiten verwendet werden.
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BSC, KTA, AEP |
Suche nach extragalaktischen kosmischen Beschleunigern: Deep learning für das Online-System von IceCube. |
Resconi |
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BSC, KTA |
Suche nach geladenen Higgs-Bosonen mit dem ATLAS-Detektor am LHC |
Kroha |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
- In vielen Erweiterungen des Standardmodells der Teilchenphysik werden zusaetzliche Higgs-Bosonen vorhergesagt, darunter auch geladene Higgs-Bosonen, deren Zerfaelle sich deutlich von denen neutraler Higgs-Bosonen abheben, indem schwere top-Quarks im Endzustand auftreten. Im Rahmen von Bachelor- und Masterarbeiten sollen die verschiedenen Zerfallskanaele und Modelle jenseits des Standardmodells mit Hilfe von Daten und Simulationen des ATLAS-Experiments am LHC untersucht werden.
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KM, AEP |
Synchronization and nonlinear dynamics of nanomechanical oscillators |
Poot |
- Research group
- Quantum Technologies
- Description
Synchronization is a universal phenomenon that is knows since they days of Huygens. When two or more oscillators with slightly different frequencies are coupled, they will start to move in phase. We can create small mechanical devices using advanced nanofabrication techniques here on campus. By sending light of the right wavelength, they start to oscillate, and when increasing the power the optomechanical coupling synchronizes them. The goal of this project is to synchronize devices made from silicon nitride, which is a special material with a lot of stress in it, and to increase the number of synchronized oscillators. The larger the system becomes, the richer the nonlinear dynamics will become. You will first make the devices in the cleanroom, measure them, and analyze the data.
See http://www.groups.ph.tum.de/en/qtech/openings/ for a detailed description of this project.
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BSC, KTA |
Test neuer Myondetektoren fuer den Ausbau des ATLAS-Detektors am Super-LHC |
Kroha |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
- Die Strahlintensitaet des Large Hadron Colliders wird in den naechsten Jahren um beinahe eine Groessenordnung erhoeht werden, um noch besseren Zugang zu neuer Physik jenseits des Standardmodells der Teilchenphysik zu gewinnen. Fuer die erhoehten Proton-Kollisionsraten an diesem Super-LHC muessen auch die Experimente wie der ATLAS-Detektor noch wesentlich verbessert werden. Hierzu werden am Max-Planck-Institut in Muenchen neuartige Myondetektoren und deren Elektronik entwickelt und gebaut. Bachelor- und Masterarbeiten sollen sich mit dem Test dieser Detektoren befassen, die in der Regel am Institut stattfinden, aber bei hohen Bestrahlungsraten auch am CERN durchgefuehrt werden koennen.
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BSC, KM |
Test und Entwicklung von RPCs für das ATLAS-Experiment am HL-LHC |
Kortner |
- Research group
- Hadronic Structure and Fundamental Symmetries
- Description
Um die Raumabdeckung und die Effizienz des Myontriggers des ATLAS-Experiments am HL-LHC zu maximieren, werden ab 2027 etwa 300 RPCs in der innersten Lage des ATLAS-Myonspektrometers eingebaut werden. Die Entwicklung dieser Kammern ist weit vorangeschritten. Für die Serienfertigung muss das Herstellungsverfahren auf eine Massenfertigung ausgerichtet werden; für den kritischen Herstellungs- schritt der Lackierung der Innenflächen der RPCs zur Gewährleistung deren Hochspannungsfestigkeit haben wir am MPI ein neues Verfahren entwickelt. RPCs, bei denen dieses Verfahren eingesetzt wird, müssen nun hergestellt und sowohl am MPI als auch am CERN auf ihre volle Funktionsfähigkeit untersucht werden.
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KM, AEP |
Tethering of molecular sensitizers on solar cell surfaces |
Barth |
- Research group
- Physics of Surfaces and Interfaces
- Description
Titanium dioxide is a semiconductor widely used in solar cells. To harness the energy of the solar spectrum, it is sensitised with dyes which are bound by single or dual tethers. Most commonly these anchors are carboxylate groups, however catecholates and hydroxamates are also reported as convenient and robust alternatives.
With this project we aim to provide a comparative study on the microscopic events that lead the different tethers to guide the adsorption of molecular dyes on model titania surfaces. Scanning tunnelling microscopy under ultra-high vacuum conditions and at a temperature range of 250 to 350 K will be used as a convenient tool to provide real-space information about the adsorption and diffusion of single and dual anchors on single crystal surfaces of titanium dioxide.
- Contact person
- Anthoula Chrysa Papageorgiou
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KM, AEP, QST |
Time-domain study of the dynamics of microwave spectral holes in the rare-earth spin ensembles |
Gross |
- Research group
- Technical Physics
- Description
- A reliable quantum memory system is being actively searched for among different types of solid-state systems. In particular, rare-earth doped spin ensembles, which possess favorable transitions in optical and microwave ranges, are promising candidates. The current project aims at developing a quantum memory system based on rare-earth spin ensembles. Such quantum memory elements should work at zero magnetic field at ultra-low temperatures. The major task of this project is to implement the spectral hole burning technique, widely used in optics, into the microwave regime.
We are looking for a highly motivated master student joining this project. Within your thesis, you will address questions regarding the dynamics of spectral holes in the absorption profiles of the rare-earth spin ensembles in the microwave regime. You will couple the spin-ensembles to the superconducting transmission lines and will manipulate the spin-states with microwave pulses. Within the project, you will learn about dynamics of the spin-states, how to synthesize microwave pulses, measure the time responses of the spin-systems and how to operate such systems at cryogenic temperatures.
- Contact person
- Nadezhda Kukharchyk
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KM, KTA, AEP, QST |
Tunable interlayer excitons in 2D heterostructures |
Finley |
- Research group
- Semiconductor Nanostructures and Quantum Systems
- Description
The field of van der Waals heterostructures, which are stacks on individual atomically thin crystal sheets, has exploded in the last decade. Specifically, heterostructures between different 2D materials have shown the emergence of interlayer excitons, due to the separation of charges at the interface. Furthermore, a lateral potential landscape, the so-called moiré potential, emerges, trapping the excitons in an egg-box shaped potential. This results in a situation where a few interlayer excitons can interact with each other, resulting in novel quantum phases.
The principal goal of this Masters's thesis is to study the optical properties of actively strain-tunable van der Waals heterostructures to examine topics such as exciton localization, many-body physics, exciton-exciton interactions in relation to the in-plane moiré potential.
During the project you will work in close collaboration with a small team of Ph.D. students and postdocs, therefore individual effort is key to drive this Masters's project.
Some knowledge in the areas of van der Waals stacking, optics, electronics, data analysis, or cleanroom fabrication will be beneficial, but secondary to your personal motivation.
You should:
(1) Be highly motivated and self-driven, (2) be practically minded with a get-things-done attitude, (3) enjoy working across a wide range of tasks (processing, optics, electronics) and (4) be willing to work in a very small team on challenging things very long hours ...
You will get:
(1) the chance to work on current hot-topic issues in the area of van der Waals heterostructures (2) gain highly sought after abilities in the field of 2D materials (3) a sound understanding of the physics in atomically thin materials and hopefully (4) a few nice papers.
- Contact person
- Andreas Stier
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BSC, KM, KTA |
Ungeordnete Quantensysteme: Vielteilchenlokalisierung |
Knap |
- Research group
- Collective Quantum Dynamics
- Description
Disorder has a drastic influence on transport properties. In the presence of a random potential, a system of electrons can become insulating; a phenomenon known as many-body localization (MBL) that has been envisioned by the Nobel laureate Phil Anderson. However, even beyond the vanishing transport such systems have very intriguing properties. For example, many-body localization describes an exotic state of matter, in which fundamental concepts of statistical mechanics break down. In this project we will explore these exciting aspects of many-body localization.
- Contact person
- Michael Knap
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KM, KTA, AEP, QST |
Untersuchung der Signalantwort des MADMAX Experiments zur Suche nach Axionen als dunkler Materie |
Majorovits |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
Im Rahmen des MADMAX Projektes zur Suche nach dunkler Materie Axionen werden verschiedene Testaufbauten bei Raumtemperatur und in flüssigem Helium (4 K) zur Kalibrierung und zur Untersuchung der genauen Signalantwort des experimentellen Aufbaus betrieben. Es werden Reflektionsdaten Daten genommen und ausgewertet.
In the frame work of the MADMAX projects several test stands at room tamperature and in liquid helium for the investigation of the detailled system response and for calibration of the setup are being operated. Reflectivity data will be atken and analyzed.
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BSC, KM, KTA, BIO, QST |
Vermessung der optischen Eigenschaften des PEN-Szintillatormaterials für LEGEND200 |
Majorovits |
- Research group
- Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
- Description
PEN ist ein industriell hergestelltes Plastikmaterial, das das Interesse als Szintillator für Experimente der Teilchenphysik auf sich gezogen hat. PEN szintilliert im blauen Regime, ideal für viele Photosensoren. Zusätzlich hat PEN exzellente mechanische Eigenschaften. Ausserdem konnte eine sehr extrem niedrige Belastung surch natürliche Radiositope nachgewiesen werden. Dies macht PEN als strukturelles, szintillierendes Material für Experimente zur Suche nach extrem seltenen Ereignissen interessant. In diesem Zusammenhang wurden PEN Platten für das LEGEND200 Experiment zur Suche nach neutrinolosem Doppelbetazerfall hergestellt. Im Rahmen dieser Arbeit sollen die optischen Eigenschaften diser Platten vermessen werden. Es sollen verschiedene PEN Samples mit einem existierenden Messaufbau auf Emissions- und Absorbtionsspektrum, sowie Lichtausbeute und Attenuierungslänge untersucht werden.
PEN is an industrial plastic that has drawn the interest as a new type of plastic scintillator material. PEN scintillates in the blue regime, which is ideal for most photosensor devices. In addition, PEN has excellent mechanical properties and very good radiopurity has been achieved, which makes it an ideal candidate as an active structural scintillator material in low-background physics experiments. In this context, PEN plates have been produced for use in the LEGEND200 experiment for the search of neutrinoless double beta decay. The goal of this thesis will be the measurement of the main optical properties of PEN. The emission and absorption spectrum, attenuation length, and light output will be measured for several PEN samples using existing setups.
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BSC, KM, AEP |
Verzerrungen in LSPS Kristallen: Einblicke durch maschinelles Lernen |
Reuter |
- Research group
- Chair of Theoretical Chemistry (Prof. Heiz komm.)
- Description
In 2011, a new solid lithium electrolyte was reported, featuring liquid-like Li-ion conduction in a crystalline solid matrix. The ultrafast room temperature transport of tetragonal Li10GeP2S12 (LGPS) with a conductivity of several mS/cm exceeds the values of most crystalline Li conductors by one order of magnitude. Accordingly, there has been a strong search in realizing LGPS-type materials based on the homologous elements Si and Sn. LXPS (X=Ge,Sn,Si) electrolytes appear in a tetragonal and orthorhombic modification. While the orthorhombic phase is an undesired inpurity in the LGPS electrolyte, orthorhombic LSPS leads to an enhancement of the conductivity. A possible explanation of the increased conductivity, is an interplay of orthorombic and tetragonal LSPS, which distorts tetragonal LSPS. This distortion may lead to a favorable opening of Li-channels. The aim of this work is to investigate the effect of distortion on the materials conductivity for tetragonal LSPS. To do so a machine-learned force-field will be provided. The project will start with the construction of distorted LSPS structures and will then focus on Molecular Dynamics (MD) calculations for appropriate LSPS ensembles at finite temperatures. Finally, the conductivities will be calculated via the Nernst-Einstein relation.
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BSC, KM, KTA, TMP |
Vielteilchensysteme mit Zwangsbedingungen |
Knap |
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BSC, KM, AEP |
Wie verrauscht sind eigentlich Elektronenstrukturtheorie-Daten? |
Reuter |
- Research group
- Chair of Theoretical Chemistry (Prof. Heiz komm.)
- Description
The combination of quantum mechanical calculations and machine-learning techniques has led to massive advances in the high-throughput computational screening of materials and molecules. Here, it is frequently stated that training data obtained from quantum mechanical simulations (e.g. using density functional theory) is 'noise-free', because the calculations can be numerically converged to very high precision. However, this assumes that the self-consistent algorithm used to calculate the Kohn-Sham determinant always converges to the correct ground-state solution, which is by no means guaranteed. The goal of this project is to quantify the noise introduced into DFT data by different choices of intital guess and convergence acceleration. To this end, the true ground-state solutions for a representative set of molecules will be determined using wavefunction stability analysis. This benchmark will allow the development of an effective 'black-box' method for obtaining well-converged training data. Furthermore, the effect of noise on quantum mechanical machine-learning applications will be studied. The candidate should be interested learning the fundamentals of density functional theory and supervised machine learning. The project will require the development of automated workflows for high-throughput electronic structure calculations and data analysis. Experience with a scripting language (e.g. Python) and UNIX operating systems is advantageous but not mandatory. Questions about the project can be directed to johannes.margraf@ch.tum.de.
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KM, KTA, BIO, AEP, BEMP |
X-ray diffraction imaging at a compact synchrotron source |
Pfeiffer |
- Research group
- Biomedical Physics
- Description
This project will focus on investigating the potential X-ray diffraction imaging at a compact synchrotron source. The student will design, conduct and evaluate experiments at the world's first X-ray source of its kind, the Munich Compact Light Source.
The project will mainly involve experimental (laboratory) work, and image processing (primarily in Python).
Character of thesis work: experimental physics (50%) & image processing (50%)
For more information, please contact: Florian Schaff (florian.schaff@tum.de) or Franz Pfeiffer (franz.pfeiffer@tum.de)
- Contact person
- Florian Schaff
- Martin Dierolf
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KM, AEP |
Zeitaufgelöste Messung des Umschaltprozesses für in der Ebene magnetisierte mikrostrukturierte Elemente |
Back |
- Research group
- Experimental Physics of Functional Spin Systems
- Description
- The demonstration of magnetization switching induced by spin-orbit torques in a ferromagnetic metal (FM)/heavy metal (HM) bilayer has attracted tremendous attention due to possible application in magnetic random access memories (MRAM). Typically, an in-plane current sent through the heavy metal layer (e.g. Pt) gives rise to a spin accumulation at the FM/HM interface due to the spin Hall effect. The spin accumulation acts on the ferromagnet (e.g. Co) via the spin transfer torque effect and leads to magnetization dynamics and, ideally, to switching.
In this Master thesis, we will use time resolved magneto-optical Kerr microscopy (TRMOKE), which is a time and spatially resolved technique, to trace the switching dynamics of an in-plane magnetized ferromagnetic metal. The following points will be addressed:
1) The Co/Pt thin films will be patterned to micrometer-size devices by using a by mask-free laser writer or by electron-beam lithography.
2) Time and spatially resolved magnetization dynamics will be measured by TRMOKE.
3) Finally, the experimental data will be compared to theory.
- Contact person
- Lin CHEN
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