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.

Latest news
Thilo's paper on two-photon spectroscopy was published

An important step towards the realization of a VUV photon condensate has been achieved.

Our paper on Quantum Rabi-dynamics of trapped atoms far in the deep strong coupling regime published in Nat. Comm.

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.

Our paper on the fluctuation-dissipation theorem appears in PRL

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 takes part in the university Excellence Slam

Andreas Redmann presented his PhD project at the Excellence Slam of the university.

Our research

© H. Brammer/U Bonn

Erbium Experiment:
Topology with Ultracold  Atoms

Eine Wissenschaftlerin und ein Wissenschaftler arbeiten hinter einer Glasfassade und mischen Chemikalien mit Großgeräten.
© AG Weitz

Rubidium Experiment:
Quantum Simulation 

© U. Vogl / AG Weitz

Ultradense Gases: Laser Cooling & Spectroscopy

© AG Weitz

Spectroscopy of High Pressure Gases:
Novel Light Sources in the VUV

© T. Damm/U Bonn

Photon Bose-Einstein-Condensation: Statistical Physics

© C. Kurtscheid/U Bonn

Bose-Einstein-Condesates of Photons in Variable Potentials


Institut für Angewandte Physik
Wegelerstraße 8
Universität Bonn
53115 Bonn, Germany

Group leader:
Prof. Dr. Martin Weitz
Tel.: +49 (0)228 73-4837

Group administration:
Kerstin Steinseifer
Tel.: +49 (0)228 73-4836

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