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Q: Fachverband Quantenoptik und Photonik

Q 8: Quantum Gases (Bosons) II

Q 8.1: Talk

Monday, March 14, 2022, 16:30–16:45, Q-H10

Floquet-heating-induced non-equilibrium Bose condensation in a dissipative optical lattice — •Alexander Schnell¹, Ling-Na Wu¹, Artur Widera², and André Eckardt¹ — ¹Technische Universität Berlin, Institut für Theoretische Physik, 10623 Berlin, Germany — ²Department of Physics and State Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany

We investigate theoretically a mixture of two weakly interacting species of bosonic quantum gases, where the parameters are such that an open-system description in terms of a Floquet-Born-Markov master equation applies. One component, the system, is a non-interacting gas in a one-dimensional optical lattice potential, the other component, the bath, is a three-dimensional weakly-interacting BEC. Interestingly, by additionally time-periodically driving the system at one lattice site, a nonequilibrium steady state that features Bose condensation can be induced in the system. Condensation can occur at bath temperatures well above equilibrium condensation temperature as well as in excited single-particle states. An intuitive explanation is that the Floquet drive induces a large inflow of heat that can be avoided by the system by condensing in a mode that decouples from the driving site. The model should be realizable with state of the art quantum gas experiments.