Dieses Bild zeigt

5th Institute of Physics

Final Theses Topics

Join our team for your Bachelor/Master thesis project!

We are always looking for motivated students to join us for their Bachelor / Master thesis project.

On this page you can find a list of topics currently offered for thesis projects at the 5th Institute of Physics. Information on the research project and team in which each topic is embedded as well as contact persons are provided below.

If you are interested in joining our team for your thesis work please do not hesitate to contact us.

Bachelor Thesis Topics

+-

In our experiment, we plan to implement optical trapping of single ionic impurities that we create by photo-ionization of parent Rydberg impurities. For this to realize it is of importance to characterize the beam profile of a micro-meter sized optical tweezer. You will develop a fully automized Piezo-based scanning system to measure the point-spread-function of a micro-tweezer generated from a high-NA aspheric lens. The goal is to identify optimal laser beam parameters to balance diffraction limited performance and undesired geometric aberrations in view of realizing minimal spot sizes.

Contact: Florian Meinert

Project: Giant Rydberg Atoms in Ultracold Quantum Gases

The main transitions of our molecules are found in the near-infrared part of the electromagnetic spectrum, where laser diodes with ample power are available. The goal of this project will be to set up a diode laser system, stabilize it to the appropriate wavelengths and detect the first molecules.

Contact: Tim Langen

Project: Cold Molecules

This project is a collaboration with the IHFG. We plan to develop a blue laser source in a compact package based on the VECSEL-technology developed at the IHFG. This light source will be integrated in our trace gas sensor project.

The new laser source will be compared to an existing commercial laser source at the PI5.

Contact: Robert Löw, Harald Kübler

Project: Quantum Optics with Hot Atoms

In this project theoretical and numerical investigations on pulsed four-wave mixing in rubidium µ-cell will be done. Temporal and spacial properties of the inverted excitation scheme including a Rydberg state are in focus. This topic is in context of the room-temperature single-photon emitter project.

Contact: Fabian Ripka, Harald Kübler

Project: Quantum Optics with Hot Atoms

This project focuses on the optogalvanic detection of a few Rb atoms in an inert background gas. The goal is to perform preliminary measurements for a trace gas sensor design based on Rydberg excitation in thermal vapor.

Contact: Robert Löw, Harald Kübler

Project: Trace Gas Sensing

 

This project focuses on a detection scheme for Rydberg atoms in thermal vapor based on pulsed field ionization. In collaboration with the electric engineering department a detection circuit based on a transimpedance amplifier will be developed and tested.

Contact: Robert Löw, Harald Kübler

Project: Trace Gas Sensing

Master Thesis Topics

+-

If you are interested in a cutting-edge interdisciplinary research on the interface of atomic physics, quantum optics, and Nano-photonics this is a proper project for you. Within the scope of this Master’s thesis, you will develop good theoretical understanding and experimental skills by working on an efficient integrated optical cavity embedded in an atomic vapor cell.

For further details please refer to this pdf file.

Contact: Hadiseh Alaeian, Tilman Pfau

Project: Quantum Optics with Hot Atoms

A Rydberg atom provide a single electron in a well defined quantum state that can cover thousands of atoms in a Bose-Einstein Condensate. We are interested to watch this single quantum imersed in a sea of atoms. On the one hand it can bind atoms into molecular states on the other habe it can backact on the collective excitations of a quantum gas. The interaction between the electron and the quantum gas is mediated by low energy scattering. The interaction depends on the electron spin and we have recently studies how this spin dependence can be used to excite very exotic "trilobite" molecules (see figure above) [2]. In this thesis we want to understand the transition from molecular physics to many-body physics [3] including the spin degree of freedom. In addition we want to study the depencence on the orbital angular momentum [4]. The experimenatl tool is high resolution spectroscopy on a BEC sample including single ion detection.

[1] Kathrin S. Kleinbach, Florian Meinert, Felix Engel, Woo Jin Kwon, Robert Löw, Tilman Pfau, Georg Raithel
"Photo-association of trilobite Rydberg molecules via resonant spin-orbit coupling"
Phys. Rev. Lett. 118, 223001 (2017)

[2] A. Gaj, A. T. Krupp, J. B. Balewski, R. Löw, S. Hofferberth, and T. Pfau
"From molecular spectra to a density shift in dense Rydberg gases"
Nature Comm. 5, 4546 (2014)

[3] A.T. Krupp, A. Gaj, J.B. Balewski, P. Ilzhöfer, S. Hofferberth, R. Löw, T. Pfau, M. Kurz, and P. Schmelcher,
"Alignment of D-state Rydberg molecules"
Phys. Rev. Lett. 112, 143008 (2014)

 

Contact: Florian Meinert

Project: Giant Rydberg Atoms in Ultracold Quantum Gases

 

The goal of this project will be the production of a cold beam of dipolar molecules using laser ablation in a cryogenic cell. In the cell, collisions with a cold Helium buffer gas will thermalize the molecules to ∼4 K. The molecular beam, which will be formed using an exit aperture in the cell, will provide very good starting conditions for subsequent laser cooling.

Contact: T. Langen

Project: Cold Molecules

The current state-of-the-art theoretical model to describe strongly dipolar Bose-Eintein condensates of Dysprosium is the so-called extended Gross-Pitaevskii equation. This equation is based on the mean-field Gross-Pitaevskii equation including the long-range anisotropic dipole-dipole interaction, to which an effective term is added to take into account the effect of beyond-mean-field corrections. These correction arise from quantum fluctuations in the fluid and act as an effective extra non-linearity. The goal of this project is to perform simulations of this equation to compare to experiments in order to test the thepry at the current level and make useful predictions for our experiments on Dysprosium. These numerical simultions are developped in our group, and they allow to implement the exact experimental conditions.

Contact:Tilman Pfau

Project: Dipolar Quantum Gases

This project is a collaboration with the IHFG. We plan to develop a blue laser source in a compact package based on the VECSEL-technology developed at the IHFG. This light source will be integrated in our trace gas sensor project.

The new laser source will be compared to an existing commercial laser source at the PI5.

Contact: Robert Löw, Harald Kübler

Project: Quantum Optics with Hot Atoms

In this thesis a commercial laser system at 420 nm will be installed in combination with a full reference set-up for application in a new excitation scheme of Rydberg four-wave mixing. This topic is in context of the room-temperature single-photon emitter project.

Contact: Fabian Ripka, Harald Kübler

Project: Quantum Optics with Hot Atoms

In collaboration with ITO a high-numeric aperture solid-immersion lenses will be placed on a glass cell. Different lens geometries will be explored and characterized. This topic is in context of the room-temperature single-photon emitter project.

Contact: Fabian Ripka, Harald Kübler

Project: Quantum Optics with Hot Atoms

Within this thesis a laser system at near-UV wavelength will be set up. With this the effect of light-induced atomic desorption will be characterized in terms of optical depth and atomic dynamics. This topic is in context of the room-temperature single-photon emitter project.

Contact: Fabian Ripka, Harald Kübler

Project: Quantum Optics with Hot Atoms

 

This project focuses on the optogalvanic detection of a few Rb atoms in an inert background gas. The goal is to perform preliminary measurements for a trace gas sensor design based on Rydberg excitation in thermal vapor.

Contact: Robert Löw, Harald Kübler

Project: Trace Gas Sensing

This project focuses on a detection scheme for Rydberg atoms in thermal vapor based on pulsed field ionization. In collaboration with the electric engineering department a detection circuit based on a transimpedance amplifier will be developed and tested.

Contact: Robert Löw, Harald Kübler

Project: Trace Gas Sensing

Teacher Candidate (Lehramt) Thesis Topics

The group "Physics Didactics Research" is constantly offering various topics for your final thesis projects. To find out more on current offerings please contact:

Ronny Nawrodt or

Holger Cartarius