Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster Quantengase

Q 64.29: Poster

Thursday, March 22, 2007, 16:30–18:30, Poster C

Ultracold Atomic Gases in 1D Lattices: A combined Bloch- and Wannier Approach — •Ilona Tuerschmann, Felix Schmitt, Markus Hild, and Robert Roth — Institut fuer Kernphysik, Technische Universitaet Darmstadt

We compare different methods to describe the correlated regime of ultracold quantum gases in 1D optical lattices. Primarily we use an exact diagonalization technique which is limited to moderate system sizes. In order to reduce the dimension of the Hilbert space we apply a physically motivated basis truncation scheme. Alternativly we accomplish pertubation theory. For the single particle basis we employ Bloch functions to describe the system in the superfluid regime. In combination with the Wannier-Basis approach for the strongly interacting regime this yields to a consistent description over the full phase diagram.