Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 10: Quantum Gases: Bosons 2
Q 10.3: Vortrag
Montag, 14. März 2011, 15:00–15:15, HÜL 386
Open Bose-Hubbard model: Beyond the mean-field approximation — •Georgios Kordas1, Dirk Witthaut2, and Sandro Wimberger1 — 1Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 19, D-69120 Heidelberg, Germany — 2Max-Plank-Institute for Dynamics and Self-Organization, D-37073 Göttingen, Germany
We investigate the dissipative dynamics of bosonic quantum gases, beyond the mean-field approximation. To this end we use a Bose-Einstein condensate in an optical lattice subject to localized particle dissipation and phase noise. Our starting point is the full many-body dynamics, which is described by a master equation. We use this equation to derive the generalized mean-field and Bogoliubov backreaction approximations. The second method is taking into account higher-order correlation functions, so it gives a much better simulation of the many-body dynamics than the mean-field approach. As it will be shown the localized particle dissipation leads to surprising dynamics, since it can suppress the decay and restore the coherence of a Bose-Einstein condensate.