Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 36: Quantum Gases: Bosons V
Q 36.3: Vortrag
Mittwoch, 25. März 2015, 11:30–11:45, P/H2
Driven-dissipative ideal Bose gases: Fragmented, excited-state and ground-state condensation — •Daniel Vorberg1,2, Roland Ketzmerick1,2, and André Eckardt1 — 1Max-Planck-Institut für Physik komplexer Systeme, Dresden — 2Institut für Theoretische Physik, Technische Universität Dresden
We consider non-equilibrium steady states of driven-dissipative bosonic quantum systems. Here Bose condensation, defined by a macroscopic eigenvalue of the single-particle density matrix, can occur not only into the ground-state but also into excited states or even into multiple states (fragmented condensation). This has been observed, for example, in exciton-polariton systems, subjected to pumping and loss. We present a theory giving a unified description of all of these different types of Bose condensation in driven-dissipative ideal gases. In particular, we identify different limiting cases where, despite the non-equilibrium character, ground-state condensation occurs. We apply our theory to exciton-polariton systems and find good agreement with experiment.