Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 13: Poster II

A 13.5: Poster

Dienstag, 15. März 2011, 18:00–20:00, P1

Self-organized phase of strongly interacting Bose gases in an optical cavity — •Yongqiang Li, Liang He, and Walter Hofstetter — Johann Wolfgang Goethe Universität Frankfurt (Main)

Motivated by a recent experiment on the BEC-cavity system [1] in which a self-organization phase transition was realized in an open system formed by a Bose-Einstein condensate coupled to an optical cavity, we numerically simulate an ultracold Bose gas in a high-finesse optical cavity by means of real-space Bosonic Dynamical Mean Field Theory [2]. We observe the phase transition from a normal to a self-organized phase and investigate the influence of superfluidity and thermal fluctuations on the self-organized phase in an optical cavity without a harmonic trap. In the presence of a harmonic trap, the coexistence of superfluid, mott-insulating and self-organized phase is observed. We find that the appearance of the wedding-cake density distribution of strongly-interacting Bose gases plays an important role on the buildup of the self-organized phase.

[1] K. Baumann, C. Guerlin, F. Brennecke and T. Esslinger, Nature 464, 1301 (2010).

[2] Y. Li, L. He, W. Hofstetter, in preparation.