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TT: Fachverband Tiefe Temperaturen

TT 48: Poster Session: Many Body Systems, Quantum Critical Phenomena

TT 48.8: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/4OG

Interacting bosons in an optical cavity: fluctuation effects — •Alla Bezvershenko, Florian Lange, and Achim Rosch — University of Cologne, Germany

We consider a chain of interacting bosonic atoms coupled to the field of an optical cavity with imperfect mirrors. In such a non-equilibrium open quantum system, temperature in the usual sense is not defined. In the conventional, theoretical mean-field approach, only the mean-field contribution of the coupling between the cavity field and the bosonic degrees of freedom is considered. We argue, however, that fluctuations beyond mean field theory are essential to obtain the effective temperature and, therefore, also the correct value of the mean-field for the atomic subsystem. Our approach is valid in a regime where the thermalization rates of the atomic system are larger than the rates of energy transfer between atoms and light.