Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantengase (Bosonische Gitter II)

Q 24.1: Vortrag

Dienstag, 20. März 2007, 14:00–14:15, 6J

A tunable quantum gas in an optical lattice — •Elmar Haller, Mattias Gustavsson, Gabriel Rojas-Kopeinig, Anton Flir, Manfred Mark, and Hanns-Christoph Nägerl — Insitut für Experimentalphysik, Innsbruck, Austria

We report on the experimental progress of loading a Bose-Einstein condensate (BEC) with 1e5 Cs atoms into 1D and 3D optical lattices to observe its dynamics as a function of interaction strength. A BEC with Cs atoms represents a tunable quantum gas as the s-wave scattering length can be widely tuned near Feshbach resonances. In the 1D case Bloch oscillations and Bragg scattering can be investigated as the interaction strength is tuned. Collisional dephasing is expected to be suppressed in the limit of weak interactions. In the 3D case the superfluid-to-Mott-insulator transition can be studied as a function of the scattering length. In particular, for a given finite depth of the 3D lattice the transition can be induced via a variation of the on-site interaction energy.