Our group conducts experiments on the following topics: thermodynamics of light, as Bose-Einstein condensation of photons in microcavities, and the statistics and dynamics of photons in tailored potentials. We also investigate topology and quantum simulation with ultracold atomic gases.
We are always looking for Bachelor, Master, PhD students, and postdocs. For more information, see here.
An important step towards the realization of a VUV photon condensate has been achieved.
Our paper “Quantum Rabi dynamics of trapped atoms far in the deep strong coupling regime“ has been published in the journal Nature Communications. We report on a study of ultrastrong coupling between two mechanical modes of trapped cold atoms in the quantum Rabi regime. Using a novel experimental scheme, we achieve a Rabi coupling of 6.5 times the field mode frequency, so that the coupling term clearly dominates over all other energy scales for the first time.
The grand-canonical coupling of photons to a bath of dye molecules leads to fluctuations of the particle number. According to the fluctuation-dissipation theorem this is connected to a viscosity of the photon gas. In our experiment, we were able to prove the relation for a Bose-Einstein condesed gas for the first time.
Andreas Redmann presented his PhD project at the Excellence Slam of the university.
Our research
Erbium Experiment:
Topology with Ultracold Atoms
Rubidium Experiment:
Quantum Simulation
Ultradense Gases: Laser Cooling & Spectroscopy
Spectroscopy of High Pressure Gases:
Novel Light Sources in the VUV
Photon Bose-Einstein-Condensation: Statistical Physics
