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TT: Fachverband Tiefe Temperaturen
TT 9: Poster Session: Correlated Electrons
TT 9.41: Poster
Dienstag, 28. September 2021, 13:30–16:00, P
Dicke transition in open many-body systems determined by fluctuation effects — •Alla Bezvershenko1, Catalin-Mihai Halati2, Ameneh Sheikhan2, Corinna Kollath2, and Achim Rosch1 — 1Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany — 2Physikalisches Institut, University of Bonn, Nussallee 12, 53115 Bonn, Germany
We develop an approach to describe the Dicke transition of interacting many-particle systems strongly coupled to the light of a lossy cavity. A mean-field approach is combined with a perturbative treatment of fluctuations beyond mean-field, which becomes exact in the thermodynamic limit. Fluctuations are crucial to determine the mixed state character of the transition and to unravel universal properties of the emerging self-organized states. A rate equation is used to calculate an effective temperature. We validate our results by comparing to time-dependent matrix-product-state calculations.