Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 33: Ultrakalte Atome II [gemeinsam mit A]

Q 33.6: Talk

Thursday, March 13, 2008, 09:45–10:00, 2F

Superfluid properties of a Bose-Einstein condensate in an optical lattice confined in a cavity — •Aranya bhuti Bhattacherjee — Max Planck-Institute for Physics of Complex System, Noethnitzer Str.38, 01187 Dresden, Germany

In this work, we study the effect of a one dimensional optical lattice in a cavity field with quantum properties on the superfluid dynamics of a Bose-Einstein condensate(BEC). In the cavity the influence of atomic backaction and the external driving pump become important and modify the optical potential. Due to the coupling between the condensate wavefunction and the cavity modes, the cavity light field develops a band structure. This study reveals that the pump and the cavity now emerges as a new handle to control the coherence properties of the BEC, which offer the potential for improved interferometric technique, quantum information processing and efficient control of nonlinear excitations such as solitons. A wealth of new phenomena can be expected in the many-body physics of quantum gases with pump-cavity mediated interaction. Expressions for the tunneling parameter, the Bloch energy, the Bogoliubov spectrum and the effective mass in a quantum optical lattice are new results, derived here for the first time.