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Q: Fachverband Quantenoptik und Photonik

Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie

Q 57.35: Poster

Donnerstag, 17. März 2011, 16:30–19:30, P1

Local mean field in optical lattices — •Astrid E. Niederle and Heiko Rieger — Universität des Saarlandes, Germany

The properties of a Bose-Einstein condensate in an optical lattice are under investigation here and studied using local mean-field theory [2]: By definition of the so called superfluid order parameter, the high dimensional Hamiltonian describing the system can be decomposed in a sum of on-site Hamiltonians. This on-site Hamiltonian forms the starting point for our investigations, in order to investigate the system in different dimensions and various geometries. Through a detailed study of the groundstate properties we observe the competing phases. The Mott lobes separate the insulating from the superfluid phase and in the presence of disorder [1] the Bose glass appears in between. Moreover this investigations in local mean-field theory can be carefully expanded to the hole spectrum in order to study time dependent effects.
[1] J. Kisker and H. Rieger, Phys. Rev. B 55, 11981 (1997)
[2] P. Buonsante, A. Vezzani, Phys. Rev. A 70, 033608 (2004)