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Prof. Dr. rer. nat. habil. Rudolf Gross

Photo von Prof. Dr. rer. nat. habil. Rudolf Gross.
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rudolf.gross@tum.de
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Arbeitsgruppe
Technische Physik
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Professur für Technische Physik
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Lehrveranstaltungen und Termine

Titel und Modulzuordnung
ArtSWSDozent(en)Termine
Physik der kondensierten Materie 1
Zuordnung zu Modulen:
VO 4 Gross, R. Hübl, H. Di, 12:00–14:00, PH HS2
Do, 10:00–12:00, PH HS2
sowie einzelne oder verschobene Termine
Supraleitung und Tieftemperaturphysik 1
Zuordnung zu Modulen:
VO 2 Hackl, R.
Leitung/Koordination: Gross, R.
Do, 12:00–14:00, PH HS3
sowie einzelne oder verschobene Termine
Fortschritte in der Festkörperphysik
Zuordnung zu Modulen:
PS 2 Gross, R. Di, 10:15–11:30
Supraleitende Quantenschaltkreise
Zuordnung zu Modulen:
PS 2 Deppe, F. Fedorov, K. Marx, A.
Leitung/Koordination: Gross, R.
Di, 14:30–16:00
Übung zu Physik der kondensierten Materie 1
Zuordnung zu Modulen:
UE 2 Geprägs, S.
Leitung/Koordination: Gross, R.
Termine in Gruppen
Übung zu Supraleitung und Tieftemperaturphysik 1
Zuordnung zu Modulen:
UE 2 Gross, R. Hackl, R. Termine in Gruppen
Festkörperkolloquium
Zuordnung zu Modulen:
KO 2 Gross, R. Do, 17:00–19:00, PH HS3
FOPRA-Versuch 16: Josephson-Effekte in Supraleitern
Zuordnung zu Modulen:
PR 1 Gross, R.
Mitwirkende: Fischer, M.Pogorzalek, S.
Walther-Meißner-Seminar über aktuelle Fragestellungen der Tieftemperatur-Festkörperphysik
Zuordnung zu Modulen:
SE 2 Gross, R. Fr, 13:30–14:45

Ausgeschriebene Angebote für Abschlussarbeiten

Electron spin dynamics in a strong coupling environment

Modern quantum circuits allow to study strong light-matter interaction in a variety of systems. This so-called strong-coupling regime requires that the coupling strength between the two subsystems exceeds their individual loss rates, rendering superconducting microwave resonators ideal due to their vanishingly low resistance. For this project, we use a paramagnetic spin ensemble of phosphorus donors in a silicon host as second system, as they show coherence and life-time in the order of seconds and minutes, respectively. The goal of this project is develop implement and develop pulse sequences to coherently control the spin ensemble and investigate the response of the coupled system.

We are looking for a highly motivated master student joining this project. The goal of your thesis is the implementation and development of adiabatic and optimal control pulse sequences for the investigation of the coherent dynamic of the coupled spin microwave system. Additionally, as microwave resonators play a vital role for the project, you will improve and taylor the existing microwave resonators for the specific needs of the project. The main goals of the project require simulation of the microwave circuits using finite element modelling, programming skills for the implementation of the pulse squences and state of the art nano-fabrication techniques.

 
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Engineering Magnetization Dynamics in a Magnetic Insulator

In magnetic resonance, a high frequency magnetic drive field is employed to excite the precessional motion of the magnetization of a magnet. Besides this fundamental excitation, where all spins are precessing in an orchestrated, collective motion, higher order magnetic resonance modes can be excited and investigated using broadband microwave spectroscopy techniques. Furthermore, as these properties rely on the „magnetic“ bandstructure of the material, they can also be tailored using nano-fabrication methods yielding engineered magnetic structures such as waveguides or resonators.

We are looking for a talented master student, who is eager to explore the different possibilities for tailoring the dynamic magnetic properties of yttrium iron garnet (YIG). The goal of your thesis is to design, fabricate and investigate tailored magnetic bandstructures in YIG, in particular also in freely suspended films. The thesis work involves simulation of the (magnetic) structures, advanced nano-patterning, as well as high frequency spectroscopy of the fabricated devices.

Contact: Hans.Huebl@wmi.badw.de, Mathias.Weiler@wmi.badw.deRudolf.Gross@wmi.badw.de

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Engineering topological magnetic phases in thin film heterostructures

In thin ferromagnetic films, the contribution from interface effects can give rise to novel magnetic properties not attainable in the bulk state of the ferromagnet. For example the magnetic anisotropy of the ferromagnet can be influenced by interfacing the ferromagnetic layer with other materials and allows to realize perpendicular magnetic anisotropy, which is now readily used in magnetic recording applications. In addition, the broken inversion symmetry at the interface leads to a Dzyaloshinskii-Moriya interaction, which allows to stabilize novel topological phases in the ferromagnetic layer (e.g. Skyrmionic lattice). The goal of this master thesis is to fabricate such thin film multilayer structures using sputter deposition techniques and analyze their magnetic properties with a focus on exploring pathways to tune the interfacial effects via different material combinations and deposition conditions.

A highly motivated master student is needed to carry out these experiments on interfacial effects in metallic multilayers. The thesis work will be split up into of the fabrication of these multilayer structures as well as the experimental study of these samples. An important aspect will be the fabrication of these multilayers using UHV sputter deposition systems. In addition, broadband ferromagnetic resonance spectroscopy and SQUID magnetometry are applied to investigate the magnetic properties of the thin film hetrostructures.

 
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Korrelationsmessungen in einem Bose-Hubbard Dimer

Nonlinear superconducting quantum circuits allow one to model artificial matter in a bottom-up approach the laboratory. At the WMI, we have recently implemented a Bose-Hubbard dimer with tunable on-site nonlinearity. Your task will be to participate in correlation measurements of such structures. By means of this technique, which is a specialty of our group, you will investigate phase transitions of this system in the driven-dissipative regime.
Kategorie: Superconducting quantum circuits; Quantum simulation; Bose-Hubbard model

Betreuer: Kirill.Fedorov@wmi.badw.de, Frank.Deppe@wmi.badw.de, Achim.Marx@wmi.badw.de , Rudolf.Gross@wmi.badw.de

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Magnetische Quantenoszillationen in dem antiferromagnetischen Supraleiter kappa-(BETS)2FeBr4

One of the challenging goals in modern materials science is the rational design of multifunctional molecular compounds that combine technologically useful features such as electrical conductivity and magnetism. A promising strategy is to create hybrid organic/inorganic crystals comprising two functional sublattices exhibiting distinct properties. Recently, several compounds have been synthesized in which the metallic conductivity is provided by organic layers sandwiched between inorganic layers responsible for magnetic ordering. The goal of the present Master thesis is to inverstigate the interplay between the magnetic and conducting subsystems in the organic superconductor k-(BETS)2FeBr4 in vicinity of the antiferromagnetic quantum phase transition. Quantum oscillations of magnetization and interlayer resistivity in strong magnetic fields will be used to probe the electronic properties of this material.

Techniques: Strong magnetic fields; magnetotransport; magnetic torque; cryogenic (liquid 4He and 3He) techniques.

Physics: Electronic correlations; magnetic quantum oscillations; antiferromagnetism.

Contact: Mark.Kartsovnik@wmi.badw.deRudolf.Gross@wmi.badw.de

geeignet als
  • Masterarbeit Physik der kondensierten Materie
Themensteller(in): Rudolf Gross
Magnetization dynamics in chiral magnets

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.

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Magneto-acoustic torques

The magnetization dynamics of magnetic materials can be manipulated by acoustic waves through magnetoelastic coupling. Corresponding experiments using GHz-frequency surface acoustic waves are routinely performed at WMI and we have a broad range of spectroscopy tools - including optical and microwave techniques - at our disposal. Now, the interaction of acoustic waves and magnetization shall be studied 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 magneto-acoustics project. During your thesis, you will use state-of-the-art nanolithography tools and thin film deposition techniques to fabricate hybrid acoustic/magnetic devices. You will characterize these devices using both optical and microwave spectroscopy methods. 

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Microwave-frequency spintronic devices

Magnetic moments and electrical currents can interact due to spin-orbit coupling. This is exploited in novel spintronic devices that are based on thin-film heavy metal / ferromagnet bilayers. During this thesis you will use direct laser writing optical lithography to define novel spintronic devices from thin-film materials. 

You will perform electrical characterization of your devices by microwave frequency vector network analysis and collaborate with Master and PhD students to study the current-driven magnetization dynamics. A key goal of your thesis is to fabricate samples that allow us to perform spatially-resolved studies of spin-orbit torques in laterally confined structures.

 
geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Rudolf Gross
Nanomechanical Devices for Vibration Sensing

Micromechanical devices are widely used to sense mechanical vibrations. Nanomechanical string resonators have extremely high quality factors and are expected to outperform their micron-sized cousins. Moreover, the latter devices are compatible with operation in vacuum and at low temperatures. 

In your Bachelor thesis you will use existing nano-scale mechanical resonators to explore and compare their sensing performance with respect to a commercial vibration sensor. In particular, you will perform optical interferometry to measure the displacement of the motion of the nanostring caused my mechanical stimulus and compare this with the thermal motion of the mechanical element. Hereby, your Bachelor thesis will be an important step for the characterization of mechanical noise in millikelvin environments.

 
geeignet als
  • Bachelorarbeit Physik
Themensteller(in): Rudolf Gross
Nano-strings excited by magnetic torques

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. 

 
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Pufferschichten für technische Leiter auf der Basis von Hochtemperatur-Supraleitern

The fabrication of ReBa2Cu3O7-δ (Re: rare earth element) (ReBCO) high temperature superconductor (HTS) based coated conductors requires the development of buffer layers (intermediate layers between a metal tape and a  superconductor). These buffer layers have to fulfill a list of requirements among which are chemical stability and  compatibility with adjacent films. Inclined substrate deposited MgO, developed by THEVA, is used as incident buffer  layer, because it creates a texture on metal substrate for the growth of HTS film and serves as a diffusion barrier for substrate elements. However, MgO is a hygroscopic material and has a high lattice mismatch with HTS, and therefore creates some technical issues for the consecutive deposition process. LaMnO3 is a perspective candidate as a terminal buffer layer due to its compatibility with MgO surfaces and is expected to provide a good template for growing ReBCO.

Depending on your qualification, following tasks will be performed during your work:
• Optimization of LaMnO3 deposition parameters
• Structural and compositional analysis (XRD, SEM, EDS, ICP)
• Deposition of GdBa2Cu3O7-δ HTS films on LaMnO3 buffered substrates
• Analysis of superconducting properties of the HTS films (Ic, Tc)

The experimental work of the master/bachelor thesis will be performed at THEVA GmbH, Ismaning. THEVA GmbH is an international, medium-sized high-tech company in the area of superconducting technology and special-purpose  systems for vacuum coating technology. For more than two decades THEVA has been developing process technologies for the manufacture of high temperature superconductors for power transmission and power  engineering. In our pilot production facility in Ismaning near Munich, we manufacture and distribute superconductors with a high power density.

Please send your application via e-mail with keywords "LMO bachelor" or "LMO master" to:
THEVA Dünnschichttechnik GmbH
Oleksiy Troshyn
Rote-Kreuz-Str. 8, 85737 Ismaning,
Tel.: 089 923346 0, E-Mail: hr@theva.com

geeignet als
  • Bachelorarbeit Physik
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Quantenteleportation im Mikrowellenbereich

One of the cornerstones of quantum communication is quantum teleportation which allows one to safely transmit an unknown quantum state. Propagating squeezed microwaves, which can nowadays be routinely prepared in the lab, can act as a quantum resource for the implementation this fundamental protocol. The goal of the current master project is to participate in the ongoing implementation of this protocol on the basis of propagating squeezed microwaves. To this end, you will perfrom cryogenic microwave measurements and data analysis in the framework of quantum physics.
Kategorie: Quantum communication; Propagating quantum microwaves; Squeezing; Entanglement

Betreuer: Kirill.Fedorov@wmi.badw.de, Frank.Deppe@wmi.badw.de, Achim.Marx@wmi.badw.de , Rudolf.Gross@wmi.badw.de

geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
Transmons play the strings: Coupled mechanical and superconducting quantum circuits for probing vibrational modes and the transfer of quantum states

Circuit nano-electro mechanics is a new field in the overlap region between solid-state physics and quantum optics with the aim of probing quantum mechanics in macroscopic mechanical structures. We employ superconducting circuits to address fundamental questions like, the preparation of phonon number states in the vibrational mode and the conversion of quantum states between the mechanical element and the microwave domain. The initial successful experiments of the group include hybrid devices based on superconducting transmon qubits, microwave resonators and mechanical nano-string resonators. You should aim at the next, important step to integrate the nanomechanical string resonator into the transmon qubit to experimentally realize a new type of interaction in light matter coupling. 

We are looking for a highly motivated master student joining this project. The goal of your thesis is the development of hybrid devices based on superconducting transmon qubits, nanomechanical string-resonators and superconducting microwave resonators as well as their spectroscopy. This includes the design and fabrication of these devices, where you will use state of the art simulation and nano-fabrication techniques. The second main aspect of your thesis is their investigation using highly sensitive microwave spectroscopy techniques in a low-temperature environment.

 
geeignet als
  • Masterarbeit Physik der kondensierten Materie
  • Masterarbeit Applied and Engineering Physics
Themensteller(in): Rudolf Gross
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