SAMOP 2023 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 22: Poster II

Q 22.6: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Bath engineering in atomic quantum gas mixtures — •Lorenz Wanckel, Alexander Schnell, and André Eckardt — Technische Universität Berlin, Institut für Theoretische Physik, 10623 Berlin, Germany

Periodically driven isolated quantum systems usually heat up over time to the infinite temperature state via resonant excitation. For open driven systems, which are allowed to dissipate energy into a thermal bath, there is a non-equilibrium steady state, which is determined by the details of driving and dissipation. Appropriate engineering of the system and bath parameters can lead to interesting system states. We investigate theoretically a one-dimensional ideal Bose gas, which is locally driven and globally coupled to a three dimensional thermal bath, given by a second species of atoms. We explore the spectral densities for various baths, fermionic and bosonic, and show that the interplay of driving and dissipation can induce Bose condensation in the ground state or some excited state at bath temperatures well above the crossover temperature, at which Bose condensation would occur as a finite size effect in the system. Our analysis, which is based on a microscopic model that is solved using Floquet-Born-Markov theory, can be used to probe the results in a realistic experiment.