Research Phase and Master's Thesis in the Physics programs

During the last year of the Master's program you will have the unique opportunity to work on exciting research topics. During this so-called research phase, you can choose from an extensive number of research groups and current projects.

Aliaksandr Bandarenka and a Master's student in his group discuss about their research. Foto: TUM.PH/Eckert. The research phase constitutes one thematic block, culminating in the dissertation of the Master's thesis.

Research Phase

The build-up of the research phase

To the scope of the one year research phase (60 ECTS) belong firstly, the development of the necessary special knowledge within a cutting-edge research line and secondly, the acquisition of the corresponding experimental or theoretical skills, that are necessary for the realization of the research project within the frame of the Master's thesis. Each of these steps conforms a module, the Master's seminar and the Master's training. Both modules belong intrinsically together and account in total for 25 ECTS. Subsequently, the independent research project can be carried out as part of the Master's thesis, which corresponding module comprises 30 ECTS. The research phase is completed with the Master's colloquium, the defense of the Master's thesis, for which 5 ECTS are given.

During the research phase, the fulfilment of an independent scientific work is tighly connected with the acquisition of additional skills, such as project management, team work as well as the depiction and presentation of scientific results.

Module	Description	Credits (CP)	PL/SL*
Master's seminar	Literature research and specialization	10	S
Master's training	Methodology and project planning	15	S
Master's thesis		30	P
Master's colloquium	Master's thesis defense	5	P
Sum		60

*: P="Prüfungsleistung", graded exam,
S="Studienleistung", non graded exam (pass/fail)

Finding a topic

Students have to take contact by their own with the working groups and potential supervisors, in oder to agree on a topic for the research phase/master thesis. Additionally to this, supervisors have the option to announce topics in the section below (supervisors see "Access for supervisors" on the right). However this possibility is not used by all institutes and not all topics are listed. Therefore it is recommended to ask the professors or in the institutes for topics.

Furthermore, it is recommended to start early (at least one semester in advance) to search for an appropriate topic. Having face-to-face interaction with the group, you can see if you like the topic and if you feel comfortable in the group (you will be working one year there!). We discourage you from simple e-mail exchange, as it is usually not successful.

Filtering in the offers for possible theses

You can search through the offers of Master’s thesis topics at the Physics Department.

Search for:

Offers of Master’s thesis topics

Study area	Topic	Supervisor
KTA	Alarm-Software fuer Gammastrahlungs-Transienten	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
KTA, AEP	Auslegung, Simulation und Design eines He Gas Reinigers zur Produktion von isotopenreinen He-4 mittels superfluider Wärmeströmung.	Paul
Research group Hadronic Structure and Fundamental Symmetries Description The FRM II is presently testing and will subsequently install a source to produce ultra-cold neutrons (UCN) in the reactor. In the central section of this UCN source, helium is used for cooling. By passing through, the cooling agent helium will be irradiated by neutrons, which create radioactive tritium out of the He-3 portion. This negative side effect can be avoided respectively reduced to a permissible level if isotopically purified He-4 with no traceable He-3 content is used. Sources for isotopically pure He-4 are scarce and availability varies with market demand. In order to ensure continuous operation of the UCN source the availability must be secured. For this reason such an isotopic purifier shall be build. In the first phase a smaller illustrator shall be designed and made to prove feasibility and validate the concept. The above master thesis is part to this first phase. In a second phase a scaled-up apparatus shall be manufactured for operational use. Contact / Supervisor: Dr. Andreas Frei, Tel. 089 289 14260, andreas.frei@tum.de Contact person Andreas Frei
BIO, M2L	Cell-size-dependent regulation of the budding yeast contractile ring	Bausch
Research group Cellular Biophysics Description The ability to robustly assemble and maintain complex intracellular structures is fundamental for cell function. The budding yeast septin ring, which sets the basis for bud formation and downstream assembly of the contractile actomyosin ring, is one of the best-studied biological self-assembly processes and serves as an important model system to understand cell polarization and non-linear feedback dynamics. However, what determines the the diameter of the emerging ring structure is so far unclear. Recently, our lab was able to demonstrate that cell size sets the septin ring diameter in an actin-dependent manner. Aim of this thesis is to use a combination of molecular biology, genetic manipulations, live-cell imaging and image analysis to reveal the molecular processes that underlie the observed scaling of ring diameter with cell volume. Ultimately, theoretical modelling will be used to obtain a quantitative understanding. This project will be carried out together with the Schmoller lab, Helmholtz Zentrum Neuherberg
KM, KTA, AEP	Das NUCLEUS Experiment: Bestimmung des Untergrundes bei tiefen Energien	Strauß
Research group Experimental Astro-Particle Physics Description NUCLEUS is an experiment aiming at the exploration of a new neutrino interaction: coherent elastic neutrino nucleus scattering (CEvNS). This detection channel offers unique possibilities to study the fundamental properties of neutrinos and adresses important questions of modern astroparticle physics. The cross-section of CEvNS is strongly enhanced compared to classic neutrino interactions (by 3-4 orders of magnitude) and therefore allows to drastically reduce the size of neutrino detectors. In Munich we have developed a prototype cryogenic detector that achieved the world-best energy threshold for nuclear recoils of about 20eV, required to exploit the full potential of CEvNS. We’ll install the detector at the CHOOZ nuclear power plant in France, one of the most intense (anti)neutrino sources on Earth. The NUCLEUS experiment is currently being built by an international collaboration lead by TUM, and is funded by the European Commission (ERC Grant), the SFB1258 and the Excellence Cluster ORIGINS. We offer an exciting experimental Masters thesis in the framework of the NUCLEUS experiment with a focus on the investigation of backgrounds at lowest energies (<1keV). The origin of the dominating backgrounds in this “new“ energy range are still unknown and its identification is crucial for the success for NUCLEUS and other upcoming CEvNS experiments. The work on the thesis will give insight to low-background techniques, cryogenic detectors and data analysis. The candidate will be fully integrated in the existing research group at TUM and work in cooperation with our international partners. Contact person Victoria Wagner Raimund Strauß Luca Maria Pattavina
KM, AEP	Defekte für die Photokatalyse	Brandt
Research group Experimental Semiconductor Physics Description Chemische Prozesse an Oberflächen wollen verstanden werden. Wir verwenden modernste Methoden der magnetischen Resonanz, um solche Elementarprozesse zu beobachten, bei denen Spins eine Rolle spielen. Untersuchungsobjekte sind hochaktuelle oxidische Materialien für die Photokatalyse, die wir mit Hilfe von elektrisch und optisch detektierter magnetischer Resonanz studieren werden. Sie erlernen die Herstellung und Charaktersisierung dieser Materialien, das Arbeiten mit Kryostaten und Lasern, sowie die Grundlagen und Anwendungen der Elektronenspinresonanz.
BSC, KM	Design of Novel Hybrid Functional Materials	Deschler
Research group Experimental Semiconductor Physics Description The Deschler group at the Walter Schottky Institute of TU Munich invites applications for Master Projects on Hybrid Functional Material Design The group The Deschler group is an independent research group at the Walter Schottky Institute of TU Munich, established through the DFG Emmy-Noether Program and an ERC Starting Grant. Our research focuses on the ultrafast dynamics of functional materials and their applications for energy applications. More information can be found on our website at www.wsi.tum.de Your project You will spearhead the design and fundamental understanding of novel functionality in hybrid materials. Specifically, this could be work on one of the following topics • Exciton Control in Ultrathin Hybrid Perovskites Control of excitons in 2D materials (TMDCs, graphene, etc.) creates new physics that cannot be found in bulk, for example exotic band structures and valley polarizations. The ability to tune the binding energy and dielectric environment of excitons in these materials provides control for targeted applications. In the class of layered perovskites, the crystal symmetry plays a crucial role for their band structure. We expect that ultrathin perovskite sheets show strong spin-dependent band modifications in analogy to the valley-splitting in TMDCs. Your task will be the design and exploration of the optical properties of these exciting new materials. • Charge Transport in Multi-functional Layered Hybrid Perovskites Materials that can do two things at once are rare, but have advantages for applications, e.g. light-absorbing electrode materials in photobatteries. The hybrid nature of layered perovskites allows us to introduce organic molecules into the crystal to add function not possible with the host perovskite. Working with chemistry department at TUM (group of Gregor Kieslich) we have designed a range of organic compounds with exciting functions (magnetic, conductive, etc), which will allow us to explore new materials. Your task would be the fabrication of high-quality crystals and thin films, for which you will explore their novel transport properties with our state-of-the art rigs. In your Master’s project in our group, you will have the chance to gain hands-on experience in the solution-/vapor-based synthesis of novel functional materials, a range of state-of-the art spectroscopic, optoelectronic and diffraction tools, as well as detailed understanding of the physics of functional semiconductors. Dedicated support from a PhD student or postdoc will be available during your project. You will be expected to make scientific discoveries and contribute to the dynamic atmosphere of our group. Your application Applications should be sent to felix.deschler@wsi.tum.de. Please include your CV, a copy of your BSc thesis and the transcript of grades of your BSc studies.
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).
KM, AEP	Donatoren in Silizium	Brandt
Research group Experimental Semiconductor Physics Description Donatoren in Halbleitern haben Sie in Ihrer Festkörper- oder Halbleiterphysik-Vorlesung umfassend besprochen. Dennoch gibt es hier noch viele Eigenschaften, die unerforscht sind. In dieser Masterarbeit geht es um den Kernspin der schwereren Donatoren in Silizium und ihre Wechselwirkung mit mechanischen Verzerrungen. Wir wollen den sog. Kern-g-Faktor bestimmen und auswerten, wie groß die Quadrupolwechselwirkung ist. Dazu verwenden wir ausgefuchste gepulste magnetische Resonanzverfahren. Sie lernen mit den neuesten Lasern umzugehen, Experimente bei Flüssig-Helium durchzuführen und Radio- und Mikrowellen zu erzeugen und zu schalten. Und nebenbei bestimmen Sie Neues in dem wohl bestverstanden Material der Welt.
BSC, KM, AEP, QST	Durchstimmung der Amplitude des Spin-Hall-Magnetwiderstands	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
BSC, KM, KTA	Dynamik im stark korrelierten Hubbard Modell	Knap
Research group Collective Quantum Dynamics
KM, AEP	Elektrisch stimulierte Nanodrahtlaser als neuartige Lichtquelle für die Silizium Photonik	Koblmüller
Research group Semiconductor Nanostructures and Quantum Systems Description Topic: III-V semiconductor nanowire lasers combine the superior optical properties of the established III-V materials with the possibility of a site-selective and monolithic integration on a common silicon-on-insulator platform. Their recent integration on silicon waveguides marked a crucial milestone towards their usage as coherent light sources for future silicon photonics applications. However, so far pumping of nanowire lasers is done opticallywhile electrical injection is crucial for a useful application as on-chip light source. The goal of this M.Sc. project is the realization of standing nanowire lasers on a silicon platform and the characterization of their electrical and electro-optical properties. Hereby, you will be closely working together with a PhD student. Your work will be settled over the whole fabrication process line from the first design of sophisticated nanowire heterostructures over their fabrication further to their analysis. The design will be guided by simulations for optimized laser cavity properties as well as electronic simulations of the doped heterostructures. Nanowire lasers should then be realized on lithographically patterned substrates by various bottom-up/top-down nanofabrication processes, including state-of-the-art processing in cleanroom environment. From electrical and optical characterization of the wires you should derive correlations between heterostructure design, electronic properties, contact behavior and electroluminescence to drive the optical emission properties of the nanowires into the lasing regime. Requirements Experience in the area of clean room fabrication and nanoanalytics as well as experience in simulations would be beneficial. Furthermore, some data analysis skills would be good: · Python or MATLAB · Origin · MS Office Nevertheless, the most important requirements are motivation and commitment. What you will gain and learn · Advanced clean room processes for state-of-the-art 3D structured nanowires · Nanoanalytics and imaging techniques (SEM, AFM) · Expertise in measurements of electrical and optical properties of nanowire heterostructures (Low-noise I-V characterization, Photo- & Electroluminescence spectroscopy) In summary, you are going to develop hands-on experience on a substantial pool of nanofabrication and -analytics methodologies available at WSI/ZNN, while contributing to a technologically and scientifically extremely relevant topic in integrated photonics. Additionally, you will get the chance to work in a top semiconductor research institute with a productive working atmosphere and a great team spirit. Application If you are interested in this topic or if you have any questions please send a mail to tobias.schreitmueller@wsi.tum.de or gregor.koblmueller@wsi.tum.de. Please include your CV, transcript of records and your Bachelor’s Thesis. Contact person Tobias Schreitmüller
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
KM, AEP	Foldamers on solid surfaces: tethering, folding and assembly	Barth
Research group Physics of Surfaces and Interfaces Description Nanoscience can arrange minute molecular entities into nanometric patterns in an orderly manner using self-assembly protocols. For practical applications, it is desirable to support such self-assembled structures on surfaces. With this project we wish to expand the capabilities of self-assembled molecular layers by mimicking the ability of biomolecules, such as proteins, to fold into well-defined conformations. Therefore, we will investigate the on-surface self-assembly of a series of foldamers: synthetic molecular strands that fold into helices. For controlling the surface deposition in the solid/vacuum interface, we will employ a home-developed electrospray controlled ion beam deposition (ES-CIBD). Scanning tunnelling microscopy (STM) under ultra-high vacuum conditions will be used as a convenient tool to provide real-space information about the molecular adsorption, conformation and self-assembly. The conformation and assembly will be controlled by thermal processing and choice of solid support. Contact person Anthoula Chrysa Papageorgiou
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.
KM, AEP	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.
BSC, KM, KTA	In-Operando Positronenstrahl-Untersuchungen von aktiven Komponenten unter extremen Bedingungen	Hugenschmidt
Research group Neutron Scattering Description NEPOMUC provides the world’s most intense positron beam. The positron is a applied as unique probe for material defect studies, surface investigation and fundamental research in quantum physics. For the experiments we typically use electrostatic acceleration to implant the positrons in the material, with the sample holder being charged to tens of kilovolts with respect to ground. In these conditions it is extremely diﬃcult to subject the sample to electric currents or potentials during the measurement, which limits the use of e+ for novel in-operando studies relevant for the construction of batteries, solar panels and integrated electronics. At NEPOMUC we are now developing an active sample holder which makes use of light to both power its onboard instrumentation and to communicate with the control system. As an applicant you will be tasked, with the support of the NEPOMUC team and the TUM facilities, to build a prototype of such sample holder, test it and program its onboard MCU. The work will involve the following tasks: Progressive assembling of the sample holder, performing electrical tests to ensure functionality after every assembling step. Programing the onboard MCU and running all of the subsystems of the sample holder in a test environment. Designing a control protocol to be run over an IRDA optical bridge and implement it. esting the autonomous functioning of the sample holder, with the system being powered through light and communicating through an optical bridge. Testing the system in UHV conditions with a 30 kV bias applied. As an applicant you will be given the opportunity to experience ﬁrst hand the development of highly specialized scientiﬁc equipment. We attach particular importance to the training aspect during the internship; as such you are not required to be able to carry out the entire task by yourself, but you will be helped and tutored by our team. This said a certain level of autonomy is expected from you.
KTA, AEP	In-situ-Videoanalyse des Blisterwachstums auf plasmaexponierten Metalloberflächen (topic is not available any more)	Stroth
Research group Plasma Surface and Divertor Physics Description Werden Metalle mit geringer Löslichkeit für Wasserstoffisotope einem H-Plasma ausgesetzt, kann es zu einer starken Übersättigung mit Wasserstoff kommen. Dies kann sich so äußern, dass das Gas in Bläschen ausperlt, welche dann als „Blister“ auf der polierten Metalloberfläche sichtbar sind. Wolfram ist eines der vielversprechendsten Materialien zum Einsatz an der Wand in Fusionsreaktoren; das oben beschriebene Verhalten ist dabei in zahlreichen Publikationen dokumentiert, die zugrundeliegenden Prozesse und ihre Dynamik sind aber noch immer nicht vollständig verstanden. In dieser Masterarbeit soll ein hochauflösendes Kamerasystem genutzt werden, um das Wachstum von Blistern im Plasma in Echtzeit zu untersuchen. Das gewonnene Videomaterial soll anschließend mit Bildanalyse-Software ausgewertet werden, um aussagekräftige Kennzahlen für den Verlauf des Blisterwachstums unter verschiedenen Bedingungen zu gewinnen. Contact: Dr. Armin Manhard
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
BSC, KTA, AEP	Investigation of irregular Ion Current Jumps in linear Ionization Manometers (topic is not available any more)	Stroth
Research group Plasma Surface and Divertor Physics Description For measuring the neutral particle flux in devices for magnetic confinement fusion, linear hot cathode ionization manometers are used. For this diagnostic, a hot cathode emits electrons, which accelerate in an electric field and ionize neutral gas particles inside the measurement head. An individual electrode collects the ions. The measured ion current is used to calculate the present neutral gas density. Occasionally, it is observed that the ion current varies drastically while the neutral gas density stays largely constant. Apparently irregular, instantaneous changes between distinct current levels is a property of this effect. Characterization, investigation and possible prevention of these sudden jumps are the topics of this master thesis. First, the parameter regime (pressure, temperature, magnetic field strength and alignment) in which the jumps occur should be narrowed down. Secondly, the influence of the different parameters should be disentangled in dedicated experiments performed in the neutral gas lab at IPP. The outcome of this thesis will be of direct importance for the manometer diagnostics of present devices as well as of ITER. Contact: Dr. Gregor Birkenmeier,
KM, KTA, AEP, QST	Kernspintomografie auf der Mikrometer-Skala	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)
KM, AEP, QST	Korrelationen in einem supraleitenden Bose-Hubbard-Dimer	Gross
Research group Technical Physics Description Nonlinear superconducting quantum circuits are famous for quantum computing. In addition, they allow one to model artificial matter in a bottom-up approach in the laboratory. At WMI, we have recently implemented a Bose-Hubbard dimer with tunable on-site nonlinearity. Depending on your preferences and abilities, you can participate in measurements or numerical/analytical simulations on expected phase transitions. Keywords: Superconducting quantum circuits; Quantum simulation; Bose-Hubbard model Contact person Frank Deppe
KM, KTA, BIO, AEP, BEMP	Machine Learning/ AI algorithms applied to advanced phase- and darkfield-CT reconstruction algorithms.	Pfeiffer
Research group Biomedical Physics Description This project will focus on applying machine learning algorithms/ AI to improve reconstruction algorithms for advanced CT imaging, namely grating-based phase- and darkfild-CT. The project will involve working with PyTorch and/or TensorFlow/Keras, and will be carried out within a collaboration with TUM Informatics (PD Dr. Tobias Lasser). // Character of thesis work: mainly computational physics & image processing // For more information, please contact: Tobias Lasser (tobias.lassser@tum.de), Clemens Schmid (clem.schmid@tum.de), or Franz Pfeiffer (franz.pfeiffer@tum.de) Contact person Clemens Schmid
BSC, KM	Machine Learning-Studien zur Suche nach supersymmetrischen stau-Leptonen mit dem ATLAS-Detektor am LHC	Kroha
Research group Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP) Description Machine Learning-Methoden eroeffnen neue Moeglichkeiten fuer die Suche nach seltenen neuen Teilchen in Proton-Kollision bei hoechsten Energien. Die Effizienz dieser Methoden soll anhand der Suche nach supersymmetrischen stau-Leptonen untersucht werden.
KM, AEP	Magnetization dynamics in chiral magnets	Gross
Research group Technical Physics Description Chiral magnetic materials show exotic magnetic properties such as a skyrmion lattice phase and have strong application potential for future spintronic devices. For these applications, a detailed understanding of the magnetization dynamics in these materials is required. At WMI, we routinely use broadband magnetic resonance spectroscopy to study magnetization dynamics as a function of magnetic field, temperature and frequency in a wide range of different materials. Now, magnetization dynamics in thin film and bulk chiral magnets shall be explored, with a focus on novel resonance phenomena. We are looking for a highly motivated and talented master student who is interested in joining our magnetization dynamics project. During your thesis, you will use state-of-the-art microwave equipment such as vector network analyzers as well as magnet cryostats and will work on the forefront of a rapidly developing scientific field. Contact person Mathias Weiler
KM, AEP, QST	Magnetomechanik mit freischwebenden Nanostrukturen	Hübl
Research group Technical Physics Description Nano-mechanical strings are archetypical harmonic oscillators and can be straightforwardly integrated with other nanoscale systems. For example, the field of nano-electromechanics studies the coupling of nano-strings to microwave circuits, which resulted in the creation of mechanical quantum states and concepts for microwave to optics conversion. Here, we plan to investigate an alternative hybrid system based on ferromagnetic nanostructures integrated with nano-strings or nano-mechanical platforms. These hybrid devices enable the design and the investigation of spin-phonon coupling down to the single excitation level and are expected to allow the investigation of the Einstein-de Haas on the nanoscale, where the angular momentum change arising from magnetization reversal is transferred into a mechanical vibration of the beam. In addition, these systems are key for the investigation of strong magnon-phonon coupling. We are looking for a motivated master student for a nano-mechanical master thesis in the context of magnon-phonon interaction. The goal of your project is to investigate the static and dynamic interplay between the mechanical and magnetic properties of a nano-mechanical system sharing an interface with a magnetic layer. In your thesis project you will fabricate freely suspended nanostructures based on silicon nitride or silicon and deposit on them ferromagnetic multi layers using state-of-the-art nano-lithography and metal deposition techniques. Further, you will probe the mechanical response of the nano-structures using optical interferometry while exciting the magnetization dynamics of the magnetic system Contact person Rudolf Gross
KM, AEP, QST	Manipulation von Spinwellen mit durch Spin-Bahn-Koppling vermittelten Drehmomenten	Gross
Research group Technical Physics Description The field of magnonics deals with exploiting the collective spin dynamics (spin waves) of magnetically ordered materials for computational purposes. Efficient and scalable schemes for controlling spin waves in thin film ferromagnets thus have large application relevance. The magnetic torques arising due to the spin-orbit interaction allow to control spin waves by electric currents and acoustic waves at GHz frequencies. We are particularly interested in a spatially-resolved study of the interaction of spin waves with acoustic and current-induced torques in nanopatterned devices with application potential for spintronics. We are looking for a talented and highly motivated master student who is interested in joining our spin dynamics project. During your thesis, you will use state-of-the-art nanolithography and thin film deposition tools to fabricate hybrid devices that allow for the interaction of spin waves with electrical currents and acoustic waves. You will study spin waves in these devices using optical and microwave spectroscopy methods Contact person Mathias Weiler
KM, AEP	Nano-strings excited by magnetic torques	Gross
Research group Technical Physics Description Nano-mechanical beams are prototype harmonic oscillators, and can be straightforwardly integrated with other nanoscale systems. For example, coupling nano-beams to coplanar microwave cavities yields so-called hybrid electro-mechanical systems with intriguing properties, e.g., electro-mechanically induced transparency. In a similar fashion, ferromagnetic nanostructures can be integrated with nano-beams. This enables the design and the investigation of spin-phonon coupling down to the single excitation level, or nanoscale Einstein-de Haas experiments, in which the angular momentum change arising from magnetization reversal is transferred into a mechanical vibration of the beam. We are looking for a motivated master student for a magnetic nano-beam oriented master thesis. The goal of your project is to investigate the static and dynamic interplay between the mechanical properties of double layer nano-beams and its magnetic properties. In your thesis project you will fabricate freely suspended nanostructures based on silicon nitride and ferromagnetic multi layers using state-of-the-art nano-lithography and metal deposition techniques. Further, you will probe the mechanical response of the nano-structures using optical interferometry while exciting the magnetization dynamics of the magnetic system. Contact person Hans Hübl
BSC, KM, KTA	Nanostrommonitore mit hoher Bandbreite für die Positronenstrahlen	Hugenschmidt
Research group Neutron Scattering Description NEPOMUC provides the world’s most intense positron beam. The positron is a applied as unique probe for material defect studies, surface investigation and fundamental research in quantum physics. Steering and optimization of the positron beam requires the employment of diagnostic devices capable of determining the position and size of the beam along the transfer line. Ideally such devices should be fast, precise, reliable and inexpensive enough for an abundance of them to be installed along the transfer line. A possible approach to synthesizing such devices is that of employing Faraday-cups-like charge collectors to partially shield the beam path and to measure the collected positron current as a function of the Faraday cup position. Your job as an applicant will be that of building, with the support of the NEPOMUC team and the physics department mechanical workshop, a working prototype of such device and characterize its performance. The work will involve the following tasks: Optimizing a proposed design for the device, selecting the proper size and type of electronic and mechanical components according to available technology. Producing the CAD drawing necessary for the manufacture of the device. Supervising the manufacture of the prototype. Characterizing the performance of the device, either with a test beam or directly at NEPOMUC. (Optional) Writing the ﬁrmware necessary to run a control board for the device. As the required task is by its nature extremely interdisciplinary, you are not required to be able to follow through the entire design and construction process by yourself and will, instead, be provided with guidance and tutoring. This is also in accord with the particular importance that we, as an institution, attach to the training aspect during the internship. This said a certain level of autonomy is expected from you.
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.
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.
KM, KTA, AEP, M2L	Numeric optimisation of a neutron spectrometer	Wuttke
Research group Jülich Center for Neutron Science Description Mosaic crystals, made for instance of pyrolitic graphite, consist of random oriented crystalline plates. They are used as beam deflectors and monochromators in neutron and x-ray optics. We have recently established spectral collocation as numerical method for computing deflected beam profiles. In this thesis, our theory, and the associated C++ implementation, shall be extended to a rotating stack of tilted mosaic crystals. This simulation shall then be used to optimise the beam optics of the neutron backscattering spectrometer at FRM2. - This work takes place in the Scientific Computing Group of Heinz Maier-Leibnitz Zentrum Garching. Optionally, it can be combined with paid C++ programming work.
KM, AEP	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.
KM, AEP, QST	Oxidische Heterostrukturen für Experimente mit reinen Spinströmen	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 Matthias Althammer Matthias Opel Stephan Geprägs
BSC, KM, KTA	Positronenexperimente zur Defektsusheilung in Kristallen bei hohen Temperaturen mittels eines neuartigen LED-Heizers	Hugenschmidt
Research group Neutron Scattering Description Am Positronenexperimente zur Defektsusheilung in Kristallen bei hohen Temperaturen mittels eines neuartigen LED-Heizers FRM II existiert mit NEPOMUC(Neutron-induced Positron source Munich) die Anlage mit dem weltweit intensivsten Positronenstrahl. Um mit diesem Strahl insbesondere Kristalldefekte und deren Ausheilung zu untersuchen ist ein heizbarer Probenhalter notwendig. Da mittlerweile kostengünstige LEDs mit hoher Lichtstrom (> 1.1 × 10 4lm bei 100 W Leistungsaufnahme) verfügbar sind, soll ein neuer Probenhalter gebaut werden, um Temperaturen von mehr als 1300 K zu ermöglichen. Nach erfolgreichem Aufbau soll das Ausheilverhalten verschiedener Metallproben mit in-situ Positronenannihilationsspektroskopie gemessen werden. Die Arbeit gliedert sich in folgende Abschnitte: Konstruktion eines Hochvakuums-, Hochspannungs- und Hochtemperaturfähigen Aufbaus Einbau und Inbetriebnahme am Spektrometer vor Ort Messung des Ausheilverhalten von Kristalldefekten in Metalleinkristallen
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.
KM, AEP, QST	Quanten-Illumination und -Sensorik mit Mikrowellen	Deppe
Research group Technical Physics Description Quantum microwaves emitted by superconducting circuits can be used for distributed quantum computation or improved quantum illumination/radar. You will join the Quantum Flagship activities on the latter, working towards the demonstration of a quantum advantage in a laboratory setting. Keywords: Quantum microwaves, quantum communication, quantum illumination, quantum radar Contact person Rudolf Gross
KM, AEP, QST	Quantenlimitierte Josephson Parametrische Verstärker für das Ku-Band	Gross
Research group Technical Physics Description Josephson parametric amplifiers (JPAs) are key components in the broad and thriving area of quantum information processing with superconducting circuits. Nowadays, they allow for quantum-limited amplification of microwave signals at the frequencies of several GHz. Thereby, they enable efficient quantum state tomography of various systems and detection of extremely weak microwave signals. Extending these devices into the higher frequency range has many practical reasons such as potential improvement of JPA amplification properties. Additionally, there is a big interest in high-frequency JPAs in dark matter axion search experiments, where quantum-limited sensitivity is the key at the frequencies between 10 to 100 GHz corresponding to the axion mass. In this project, we plan to develop and fabricate flux-driven superconducting JPA designs applicable for the Ku-band frequencies. We will investigate the impact of quasiparticle and surface losses on amplification properties in the proposed frequency range. Finally, we intend to characterize and optimize gain and noise properties of the newly developed JPAs. The master project consists of designing superconducting Josephson parametric amplifiers, fabricating the latter with electron beam lithography and aluminum shadow evaporation techniques, and performing cryogenic microwave measurements. Contact person Kirill Fedorov
KM, AEP	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.
KM, AEP	Qubits in Diamant elektrisch auslesen	Brandt
Research group Experimental Semiconductor Physics Description Farbzentren in Diamant eignen sich hervoragend zum Messen kleinster magnetischer Felder und als Quantenbits. Eine Herausvorderung stellt noch der einfache Nachweis des Spinzustandes dieser Zentren dar. In Fortführung einer zur Zeit laufenden Masterarbeit soll die Dynamik des Auslesens über den Photostrom unter Verwendung unterschiedlicher Laser untersucht und die Empfindlichkeit der Methode hin zum Nachweis einzelner Zentren weiterentwickelt werden. Sie erlernen dabei Optik, das Arbeiten mit Mikrowellen, magnetische Resonanz und die Grundlagen der Quanteninformationsverarbeitung.
KTA	Search for New Particles at the COMPASS Experiment at CERN	Paul
Research group Hadronic Structure and Fundamental Symmetries Description In nature, quarks and gluons cannot exist as free particles. They are always confined into hadrons. Unfortunately, the equations of the strong interaction that governs the behavior of quarks and gluons cannot be directly solved at energy scales where hadrons form. Hence theoretical predictions of hadron properties such as their masses and decay modes are very difficult. This is in particular true for hadrons that are made of the three lightest quarks: „up“, „down“, and „strange“. Also on the experimental side much confusion exists on what concerns masses, decay widths, and the assignment of quantum numbers of some observed hadrons, let alone the interpretation of their internal structure. Our group participates in the COMPASS experiment at CERN, where we study the production of mesons (hadrons with integer spin) in the scattering of a 190 GeV pion beam off a stationary proton target. The produced highly excited mesons have extremely short life times of the order of 10^-24 seconds and can hence be measured only via their decay products. Our group employs and develops mathematically involved statistical analysis tools in order to identify the produced mesons with high sensitivity and to measure their properties with high precision. We have recently found a new meson with surprising properties and also did groundbreaking work on precision measurements of the properties of the pion. This science is directly connected to the understanding of the strong force at large distances and low energies and the search for new forms of matter and therefore addresses one of the last open questions of the Standard Model. This science project, involves the use of several state-of-the-art technologies: Building of analysis models in close collaboration with theorists Handling of very large data sets (several Petabytes) Elaborate data fitting with more than 1000 parameters Use of large computing clusters (200 cores at E18 + 2000 cores at LRZ/Excellence cluster) Software development to exploit new CPU/GPU technologies In addition, we operate and maintain a large-scale scientific apparatus, which involves tasks like: Calibration of particle detectors Adaptation of large simulation codes We offer thesis topics at various levels of difficulty, which cover a wide range of subjects in strong-interaction physics, statistics, and/or computer science. They include for example Data handling and event selection Simulation of high-energy scattering processes and detector response Estimation of model parameters from high-dimensional data Model building and model selection Parallelization of analysis software You have the opportunity to perform your own science analysis, e.g. searching for new particles and determining their properties. The analysis work can start at different levels within the analysis chain: from the selection of a reaction process itself in order to study the feasibility of a full-fletched analysis up to the final fitting process leading to scientific publications. The topic can be chosen according to personal preference and interest. Thesis projects usually involve travels to CERN. Experience in programming (C++, Python) is helpful, but not required. Contact: Boris Grube , room PH1 3574, Tel. 089 289 12588 Contact person Boris Grube
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.
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.
KM, AEP	Spinabhängige Prozesse in der Elektrochemie	Brandt
Research group Experimental Semiconductor Physics Description In vielen wichtigen elektrochemischen Prozessen (wie zB der Reduktion von CO₂) vermutet man Prozesse, bei denen zwei Radikale beteiligt sind. Interessanterweise wurden diese chemischen Elementarprozesse noch nicht beobachtet. In dieser Arbeit soll eine elektrochemische Zelle in ein klassisches Spinresonanz-Spektrometer integriert werden und dann die Signatur solcher Biradikale im Stromtransport beobachtet werden. Sie werden in dieser Masterarbeit hochempfindliche Methoden der magnetischen Resonanz sowie die wichtigsten Askepte der Elektrochemie kennenlernen und an einem Thema an der vordersten Front der Physik und Chemie des Klimawandels forschen.
KM, AEP, QST	Spintransport in Supraleiter/Ferromagnet-Heterostrukturen	Gross
Research group Technical Physics Description The combination of ferromagnetic and superconducting materials leads to intriguing proximity effects at the interface of the two materials. The goal of this thesis is to investigate the spin transport of superconductor/ferromagnet interfaces and model the obtained results in the framework of proximity effects. To this end, we will use broadband ferromagnetic resonance and magnetoresistance effects to inject a spin current into the superconductor. This requires investigations at low temperatures around the critical temperature of the superconductor in large magnetic fields. For the superconductor/ferromagnet magnetoresistance effects, the magnetic field orientation dependence and its influence on the Andreev reflection contribution is the focus of this study. We are looking for a talented master student to investigate spin transport in superconductor/ferromagnet heterostructures. The thesis deals with the fabrication of these heterostructures using our new UHV sputtering system and structuring of the blanket films with optical and electron beam lithography. In addition, characterization of theses heterostructures at low temperatures will be conducted in superconducting magnet cryostats. Here, high frequency spin dynamics as well magnetotransport studies will be conducted Contact person Matthias Althammer
KM, AEP, QST	Steuerung des Magnonentransports	Gross
Research group Technical Physics Description Magnon transport in magnetic insulators has similarities and differences compared to the familiar transport properties of their charge counterparts. For example, diffusive transport is a shared feature, while the obvious difference is that charges are a conserved quantity and magnons are excitations decaying with a characteristic lifetime. The aim of this thesis is to obtain a better understanding how to control the magnon transport in magnetic insulators (e.g. yttrium iron garnet). In particular, we plan to focus on heat driven magnon transport properties as well as the control of the magnon conductance by electrical means. Interesting transport observables in this context will be magnon resistivity as well as the investigation of magnon correlation length. We are looking for a master student interested in magnon transport experiments. In order to answer questions regarding magnon transport in magnetic insulators, your thesis will contain aspects of the fabrication of nano-scale devices using electron beam lithography as well as ultra-sensitive low-noise electronic measurements in a cryogenic environment Contact person Matthias Althammer
KM, AEP	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.
BSC, KM	Suche nach Dunkler Materie in Proton-Proton-Kollisionen bei 13 TeV Schwerpunktsenergie mit dem ATLAS-Detektor	Kroha
Research group Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP) Description Der Large Hadron Collider (LHC) bietet eine einzigartige Gelegenheit, nach Teilchen der Dunklen Materie zu suchen. Sie machen sich im Detektor durch sogenannte fehlende Energie bemerkbar. Zusaetzlich muessen jedoch bekannte Teilchen als Signal erzeugt werden. Dafuer eignen sich besonders gut Hadronjets, die durch Gluonabstrahlung im Anfangszustand haeufig erzeugt werden, aber auch Eichbosonen und sogar das Higgs-Boson. Die Auswahlkriterien fuer solche Ereignisse werden mit Hilfe simulierter Daten optimiert.
BSC, KM	Suche nach unsichtbaren Higgs-Bosonzerfaellen am LHC mit Hilfe von Machine Learning-Methoden	Kroha
Research group Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP) Description Neue Machine Learning-Methoden werden immer wichtiger fuer die Suche nach seltenen neuen Teilchen am Large Hadron Collider (LHC). Einiger dieser Methoden sollen fuer die Suche nach unsichtbaren Higgs-Bosonzerfaellen untersucht werden, die Hinweise auf Dunkle Materie liefern koennten.
KM, AEP	Synchronization and nonlinear dynamics of nanomechanical oscillators (topic is not available any more)	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.
BSC, KTA	Test einer Anger Kamera fuer Gamma-Spektroskopie	Greiner
Research group Max-Planck-Institue for Extraterrestrial Physics (MPE) Description The improvements of Silicon photo-multipliers (SiPM) over the last years qualify them as promising replacements for classical photo-multiplier tubes (PMT). This is particularly interesting for cases where the high voltages and large dimensions of PMTs are difficult to afford, such as for space applications. For the simplest version of gamma-ray detectors, a scintillator crystal read out by SiPMs, the size of the scintillator determines the sensitivity, and thus should stay large. This suggests an Anger camera principle as the most efficient way for a gamma-ray detector in space: a mosaic of sparsely distributed single-cell SiPMs instead of the coverage of the full scintillator area. This Master thesis shall test and optimize a 5x5 cm^2 sized CeBr3 scintillator read out with a mosaic of SiPMs. Measurements of the spatial and spectral resolution as well as efficiency (noise) and power consumption are foreseen, and form the basic parameters for the trade-off study. The set-up has two potential applications: (i) in the ComPol Cubesat mission pursued within the Origins Cluster of Excellence, and (ii) the POLAR-2 gamma-ray burst polarisation mission developed within the SFB "Neutrinos and Dark Matter". Interest in electronics and ASIC readout is required, and some background in astrophysics is advantegeous. The lab-work will be done at MPP Freimann, shared with Prof. S. Mertens group. Contact: Jochen Greiner, jcg@mpe.mpg.de, MPE Room 1.3.13, Tel. 30000-3847
BSC, KM	Test neuer Myondetektoren fuer das ATLAS-Experiment am LHC bei hohen Strahlintensitaeten	Kroha
Research group Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP) Description Fuer den Ausbau des ATLAS-Experiments fuer 10-fach hoehere Protonstrahlintesitaeten am LHC werden zur Zeit am Max-Planck-Institut neue praezise Myondetektoren gebaut und in Betrieb genommen. Eingehende Tests dieser Detektoren sollen am Institut und - bei Interesse - am CERN durchgefuehrt werden.
KM, AEP, QST	Topologische magnetische Phasen in Dünnschicht-Heterostrukturen	Gross
Research group Technical Physics Description The broken inversion symmetry at the interface of thin film ferromagnets and normal metals with strong spin-orbit coupling can give rise to chiral magnetic order. These chiral magnetic materials show exotic magnetic properties such as a skyrmion lattice phase and have strong application potential for future spintronic devices. For these applications, a detailed understanding of the magnetization dynamics in these materials is required. The goal of this master thesis is to fabricate such thin film multilayer structures using sputter deposition techniques and analyze their dynamic magnetic properties using broadband ferromagnetic resonance spectroscopy. We are looking for a highly motivated master student to carry out these experiments on interfacial effects in metallic multilayers. In this thesis you will work on the fabrication of these multilayer structures using UHV sputter deposition systems and subsequently determine their magnetic properties using broadband ferromagnetic resonance spectroscopy and SQUID magnetometry Contact person Mathias Weiler Matthias Althammer
KM	Ultrafast Optical Spectroscopy of Material Dynamics	Deschler
Research group Experimental Semiconductor Physics Description The Deschler group at the Walter Schottky Institute of TU Munich invites applications for Master Projects on Ultrafast Spectroscopy of Material Dynamics The group The Deschler group is an independent research group at the Walter Schottky Institute of TU Munich, established through the DFG Emmy-Noether Program and an ERC Starting Grant. Its research focuses on the ultrafast dynamics of functional materials and their applications for energy applications. More information can be found on our website at www.wsi.tum.de Your project You will spearhead the design and operation of cutting-edge spectroscopic setups to explore excited state dynamics in functional materials. Specifically, this could be work on one of the following topics • Femtosecond Luminescence Spectroscopy Maximizing luminescence yields requires fundamental insights how the luminescence is created. The emergence of photon emission after excitation of the material provides here fundamental information about the interactions of electrons and holes, as well as the nature of the band structure of the material. In this project you will develop a highly-sensitive femtosecond luminescence setup to explore radiative recombination in a previously inaccessible regime in a range of seminal semiconductors, such as hybrid perovskites and 2D materials. • Time-resolved Spin Dynamics Materials that combine magnetic and semiconducting properties are desired for spintronic applications. Optical properties such as the polarization of the luminescence can be controlled via the spin-alignment in these materials. In this project you will design ultrafast optical setups that use Faraday rotation to detect optical spin alignment and transfer in a range of novel materials, such as 2D magnetic semiconductors. From the combination of excited state population and spin dynamics you will explore the underlying physical mechanisms of spin alignment. In your Master’s project in our group, you will have the chance to gain hands-on experience in state-of-the art broadband spectroscopy, as well as detailed understanding of functional semiconductor dynamics. Dedicated support from a PhD student or postdoc will be available during your project. You will be expected to make scientific discoveries and contribute to the dynamic atmosphere of our group. Your application Applications should be sent to felix.deschler@wsi.tum.de. Please include your CV, a copy of your BSc thesis and the transcript of grades of your BSc studies.
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
BSC, KM	Untersuchung der mechanischen Eigenschaften von Praezisionsmyondetektoren für das ATLAS-Experiment	Kroha
Research group Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
BSC, KM	Untersuchung der Nachweiseffizienz der Praezionsmyondetektoren des ATLAS-Experiments	Kroha
Research group Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
BSC, KM	Untersuchung der Ortsaufloesung der Praezisionsmyondetektoren des ATLAS-Experiments	Kroha
Research group Max-Planck-Institute for Physics / Werner-Heisenberg-Institute (MPP)
KM, AEP, QST	Verbesserter Herstellungsprozess für supraleitende Quantenbits (topic is not available any more)	Gross
Research group Technical Physics Description Nonlinear superconducting quantum circuits, especially the transmon qubits, are famous for quantum computing. Nevertheless, their fabrication is demanding and has to be improved continually. Your task will be to join the efforts to improve the WMI qubit process on cleanroom fabrication and measurements. Keywords: Superconducting quantum circuits; quantum computing Contact person Frank Deppe Yuki Nojiri
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.
BSC, KM, AEP	Verzerrungen in LSPS Kristallen: Einblicke durch maschinelles Lernen	Reuter
Research group Chair of Theoretical Chemistry (Prof. Reuter) 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.
BSC, KM, KTA, TMP	Vielteilchensysteme mit Zwangsbedingungen	Knap
Research group Collective Quantum Dynamics
BSC, KM, AEP	Wie verrauscht sind eigentlich Elektronenstrukturtheorie-Daten?	Reuter
Research group Chair of Theoretical Chemistry (Prof. Reuter) 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.

Registering the research phase

The registration to all modules belonging to the research phase is done at once in the Dean's Office (Dekanat), normally at the beginning of the third Master's semester. When doing this, the certificate of mentor counseling has to be included. After agreeing on a topic with the future supervisor, students can print out the registration form in the student access.

After six months the Master's thesis should begin. Passing the Master's seminar and the Master's training will be recorded in TUMonline and you are officially alowed to start the thesis.

Handing in the thesis and getting the grade

Before handing in the Master's thesis, you must fill in the final titel of the thesis in the database (student access) and upload an electronic copy (PDF-file). Afterwards, you have to hand in two printed versions in the Dean's Office (Dekanat). You have to hand in the thesis at the latest on the deadline, please keep this on mind.

Extension of the deadline is only possible for good reasons. See FAQ on Thesis extension.

The Master's thesis will be evaluated by the supervisor and a second examiner. The second examiner is appointed by the examination board on suggestion of the supervisor (after official registration of Master’s thesis).

The supervisor and the second examiner will also grade the Master's colloquium, which completes the research phase.

Re-enrollment during the research phase

For any examination you must be enrolled as a student of TUM. Hence you need to re-enroll for one semester more e.g. if you hand in your Master’s thesis or your Master’s colloquium takes place after the current semester ends. According to APSO, coursework and examinations until the first week of the lectures of the next semester are counted for the current semester – but for the Master's Thesis the rule is: you must be enrolled at the date you hand in your thesis (meaning handing in after 1st of April or 1st of October is impossible if your are not re-enrolled in summer or winter semester respectively)

With a due date for your thesis e.g. in October, you should not forget to re-enroll for the winter semester and the corresponding deadline would be August 15.

Organization of the colloquium

The Master’s colloquium is organised and conducted by the supervisor together with the second examiner. The Master’s colloquium takes approximately 60 minutes, consisting of a 30 minutes talk and 30 minutes examination. Naturally, the inclusion of the colloquium in a group seminar is possible.

Completing your Master studies

At the end of the semester in which you reach the necessary 120 ECTS in your Master's degree program you will be exmatriculated (according to §13(1) enrolment rules of TUM). In most cases the Master's colloquium will be the last exam to reach this point.

Taking further exams and final documents

You are principally allowed to take further exams after reaching the 120 ECTS, i.e. to replace previous results in the catalog of special courses or non-physics courses with better results. Therefore it is generally not possible that the final documents are generated before you are exmatriculated. In case you need the final documents (or even preliminary documents) earlier, you have to request for it explicitly. See the Remarks on end of studies and final documents for further information.

Deriving the final grade

The final grade is the ECTS-weighted average of the graded exams, which are used to fulfill the 120 ECTS. These are the compulsory optional subject in theoretical physics, the special courses, the non-physics courses, the Master's thesis and colloquium.

If you have taken more than 30 ECTS in the special courses or more than 8 ECTS in the non-physics elective courses, then TUMonline will try to find the combination, which results in the best final grade. Redundant courses will be listed as "additional courses" in your transcript. If you want a different combination than the one TUMonline is suggesting, please contact the coordinator of the Master's degree program before the final documents are printed.

Nr.	Module	Credits (CP)	ca. %
1	Theoretical physics	10	12
2	Special courses	30	36
3	Non-Physics courses	8	10
4	Master's thesis	30	36
5	Master's colloquium	5	6
	Sum	83	100