Der Prüfungsausschuss hat für diesen Studiengang eine Liste mit möglichen Themensteller(inne)n erstellt. Sie sind im Folgenden aufgeführt. Um ein Thema zu finden, nehmen Sie bitte selbständig Kontakt zu den möglichen Themensteller(inne)n auf.
Die Themensteller(innen) haben die Möglichkeit Themen auszuschreiben (beachten Sie dazu den Link "Zugang für Themensteller(innen)" rechts). Allerdings sind nicht alle möglichen Themen hier ausgeschrieben, eine Nachfrage bei den Themensteller(inne)n ist daher ratsam.
Weiterhin ist es sinnvoll, frühzeitig, etwa ein Semester im Voraus, mit der Suche nach einem geeigneten Thema zu beginnen. Bei einem persönlichen Gespräch können Sie schnell erkennen, ob Ihnen ein Thema zusagt, und ob Sie sich in einer Arbeitsgruppe wohlfühlen. Eine unpersönliche Mail mit einer Anfrage führt meist nicht zum gewünschten Ziel.
Die folgenden Hochschullehrerinnen und Hochschullehrer der beiden Universitäten TUM und LMU sind vom Prüfungsausschuss als potentielle Themenstellerinnen und Themensteller berufen:
Suche und Einschränkung des Angebots
Angebot für Masterarbeiten
| Thema | Themensteller(in) |
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A finite temperature quantum algorithm for the Hubbard model |
Knap |
- Arbeitsgruppe
- Kollektive Quantendynamik
- Beschreibung
- The goal of the thesis is to develop an analyze finite temperature algorithms for quantum computers. The field is quickly evolving. Please contact me to discuss a concrete project.
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Emergent (non-linear) hydrodynamics in ultracold quantum gases |
Knap |
- Arbeitsgruppe
- Kollektive Quantendynamik
- Beschreibung
- Isolated quantum matter can thermalize locally because the surrounding system can act as a path. We will study how hydrodynamics can emerge at late times in such systems. The field of quantum dynamics is quickly evolving. Please contact me directly to discuss a concrete project.
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Fractonic quantum matter at low temperatures |
Knap |
- Arbeitsgruppe
- Kollektive Quantendynamik
- Beschreibung
- Fractonic quantum matter possesses excitations with constrained mobility. In two dimensions, excitations can for example only move on one dimensional lines. The goal of this thesis is to study either with numerical or field theoretical techniques their ground state and dynamical properties. The field of fractions is quickly evolving. Please contact me directly to discuss a concrete project.
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Magnetic resonance spectroscopy in two dimensional ferromagnets |
Gross |
- Arbeitsgruppe
- Technische Physik
- Beschreibung
- Dimensionality crucially influences the properties of materials. Two-dimensional (2d) van der Waals materials in the monolayer limit are presently heavily investigated. Within this class of materials systems with magnetic order exist, yet only limited insights have been obtained with respect to their magnetic excitation properties. A major experimental challenge is the small volume and thus low number of spins in these systems. Thus, high sensitivity techniques and large filling factors are key for successful studies of these materials. The goal of this thesis is to use planar superconducting resonators in combination with 2d van der Waals ferromagnets to study magnetic excitations at low temperatures by microwave spectroscopy.
You will work on implementing the microwave-based spectroscopy of magnetic excitations in 2d systems. You will use state-of-the-art nanofabrication techniques like electron beam lithography and thin film deposition machines for the superconducting resonators. You will also gain experience in cryogenic microwave spectroscopy utilizing vector network analyzing techniques. Another important aspect will be the development of a quantitative model to illuminate the underlying physics of the magnetic excitations.
- Betreuer(innen)
- Matthias Althammer
- Hans-Gregor Hübl
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Magnon-mechanics in suspended nano-structures |
Gross |
- Arbeitsgruppe
- Technische Physik
- Beschreibung
- 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 aim at the efficient conversion between phonons and magnons with the potential to interact with light and are thus ideal candidates for conversion applications.
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 magnetic thin films using state-of-the-art nano-lithography and 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.
- Betreuer(innen)
- Matthias Althammer
- Hans-Gregor Hübl
- Stephan Geprägs
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Nano-electromechanics in the non-linear regime |
Gross |
- Arbeitsgruppe
- Technische Physik
- Beschreibung
- Circuit nano-electromechanics 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 nano-string resonators inductively coupled to frequency tunable microwave resonators. This setting allows to explore large optomechanical single photon rates, enables intrinsic amplification schemes, and hereby allows to access a new regime of light matter coupling.
The goal of your thesis is the development and fabrication of hybrid devices based on frequency tunable superconducting microwave resonators with integrated nanomechanical string-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.
- Betreuer(innen)
- Hans-Gregor Hübl
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Non-reciprocal magnonic devices |
Gross |
- Arbeitsgruppe
- Technische Physik
- Beschreibung
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Spin waves (magnons) are the quantized excitations of the magnetic lattice in solid state systems. The field of magnonics is exploring concepts to use these magnons for information transport and processing. Of particular interest is to achieve non-reciprocity for opposite spin wave propagation directions, which can be realized in hybrid structures of a periodic artificial magnetic array on top of a magnonic waveguide. These systems would be potential candidates for compact microwave directional couplers and circulators operational at low temperatures. The goal of this thesis is to develop and optimize such nonreciprocal devices based on periodic magnetic arrays. This implementation is a first step towards compact low temperature microwave circuits relevant for superconducting quantum circuits.
You are a resourceful master student willing to contribute with your thesis towards the successful implementation of nonreciprocal microwave devices at cryogenic temperatures. You will use state-of-the-art nanofabrication techniques using electron beam lithography and thin film deposition machines to design your hybrid systems. You will also gain experience in cryogenic microwave spectroscopy utilizing vector network analyzing techniques. Utilizing a combination of numerical and analytical models, you will drive the optimization of such hybrid devices.
- Betreuer(innen)
- Hans-Gregor Hübl
- Stephan Geprägs
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Optical detection of magnetization dynamics at low temperatures |
Gross |
- Arbeitsgruppe
- Technische Physik
- Beschreibung
- Utilizing magneto-optical effects enables the investigation of excitations in magnetic systems like magnons or spin waves down to the sub-micrometer scale. In this way, one can probe spin wave propagation in micro-patterned ferromagnetic materials, which is highly relevant for spintronic applications as well the investigation of tailored quantum systems. Especially at low temperatures, novel magnetic phases exist with intriguing magnetization dynamic properties. The goal of this thesis is the optical investigation of spatially resolved magnetization dynamics in spintronic devices as well as hybrid quantum systems at cryogenic temperatures.
We are searching for a highly motivated master student to start the experiments on optically detected magnetization dynamics at cryogenic temperatures. You will improve the optical setup used for the detection of magnetization dynamics to increase the sensitivity. In addition, you will work with state-of-the-art microwave equipment to drive the magnetization dynamics in spintronic devices and hybrid systems. After assessing the performance of the setup with state-of-the-art magnetic systems, you will work in the clean room facilities of our institute to carry out the microfabrication steps to define your own spintronic devices or hybrid systems.
- Betreuer(innen)
- Matthias Althammer
- Hans-Gregor Hübl
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Optomechanics with Single Photons |
Poot |
- Arbeitsgruppe
- Quantentechnologien
- Beschreibung
In optomechanics, light is used to measure and alter the dynamics of mechanical resonators. It is by far the most sensitive method to observe the tiny vibrations that nanomechanical devices perform: in one second one can determine their position with femtometer precision! Using light to measure the mechanics is not the only aspect of optomechanics. The same light can also be used to change the dynamics of the mechanical device through a process called cavity backaction. The photons exert a force on the resonator, the so-called radiation pressure. In this project we want to explore the ultimate limits to this force. The goal is to measure the force originating from a single photon! For this it is required that the photon interacts with the mechanical resonator as strongly as possible. For this we need to the design and make very low loss optical cavities, such as microring resonators. Also, the mechanical device should have a quality factor as high as possible. You will make both the optical and mechanical components from chips with highly-stressed silicon nitride using state-of-the-art nanofabrication in the cleanroom. Then the devices are placed in a vacuum chamber for their measurement. In our highly-automated setup you can very quickly characterize many of the devices on your chip. Then, with the perfect device parameters you can start to explore the more advanced measurements. Initially we can measure the devices in with pulsed light, but by using single photons we want to explore the ultimate limits to optomechanical forces.
See http://www.groups.ph.tum.de/en/qtech/openings/ for a detailed description of this project.
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Quantum Optics on a Chip |
Poot |
- Arbeitsgruppe
- Quantentechnologien
- Beschreibung
Quantum optics is an extremely powerful approach towards quantum communication, quantum sensing, and quantum computing. In particular, quantum information stored in photons has very low decoherence and can be transmitted over large distances through optical fibers. To date, most experiments in quantum optics use optical tables full with mirrors and beam splitters that all have to be carefully aligned and stabilized. This may be good enough for initial demonstrations, but in order to bring quantum science into the realm of quantum technology, a more scalable approach is required.
With our expertise in making photonic chips using advanced nanofabrication, we are making putting these exciting quantum optics experiments on chips. Here, light is routed via optical waveguides. Furthermore, by bending a waveguide, one gets the equivalent of a free-space mirror; a beam splitter cube becomes a directional coupler and so on. By combining these elements, we can make the building block for e.g. an optical quantum computer. With that, the possibilities are almost unlimited.
For such large-scale optical quantum circuits we also want to incorporate single-photon sources, superconducting single-photon detectors, and optomechanical phase shifters. This all happens on a single chip. Making and characterizing the components is the first step and from there on, you are making more and more complex quantum chips. You will be doing the nanofabrication in the cleanroom, and then use our optical measurement setups to see how each device is performing. Depending on your preference, it may also be possible to add a modelling component to the project.
See http://www.groups.ph.tum.de/en/qtech/openings/ for a detailed description of this project.
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Sensing magnetic resonance via nitrogen vacancy centers (Thema ist bereits vergeben) |
Gross |
- Arbeitsgruppe
- Technische Physik
- Beschreibung
- Electron spin resonance provides means to very sensitive magnetic field sensors. At present charged nitrogen vacancies in diamond provide unique properties such as optical readout of the electron spin state and spin coherence above room temperature. This allows using this system for magnetic field sensing applications. You will work on implementing an experimental platform for optical readout and microwave manipulation of electron spins in nitrogen vacancy centers in your thesis. The ultimate goal is the detection of magnetic resonance via nitrogen vacancy centers in the new setup.
We are searching a skilled master student to start the experiments on optically detected electron spin resonance. You will optimize the optical setup used for the detection of spin dynamics to improve the noise floor. In addition, you will work with state-of-the-art microwave equipment to drive the magnetization dynamics of the electron spin. After assessing the performance of the setup with state-of-the-art magnetic systems, you will work on detecting magnetic resonance phenomena in solid state systems.
- Betreuer(innen)
- Matthias Althammer
- Hans-Gregor Hübl
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Strong electrostatic effects in optomechanical devices |
Poot |
- Arbeitsgruppe
- Quantentechnologien
- Beschreibung
Optomechanics provides extremely sensitive methods to measure the displacement of mechanical resonators. However, the forces are much smaller in optomechanics compared to those in nanoelectromechanical systems (NEMS). The goal of the project is to make, and measure opto-electromechanical devices which have strong electrostatic interactions. This includes the electrostatic spring effect where the resonance frequency depends strongly on the applied voltage. The next step is trying to measure the potential by measuring the ringdown of different mechanical modes. The devices will be made using advanced nanofabrication techniques such as electron beam lithography and reactive ion etching.
See http://www.groups.ph.tum.de/en/qtech/openings/ for a detailed description of this project.
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