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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.13: Poster

Dienstag, 9. März 2010, 16:00–19:00, Lichthof

A new type of hexagonal optical lattice for ultracold quantum gases — •Julian Struck, Parvis Soltan-Panahi, Wiebke Plenkers, Andreas Bick, Georg Meineke, Christoph Becker, Patrick Windpassinger, and Klaus Sengstock — Universität Hamburg, Institut für Laser-Physik, Luruper Chaussee 149, 22761 Hamburg

Ultracold atoms in optical lattices offer unique access to controllable quantum many-body systems, reaching from the weakly-interacting to the strongly-correlated regime. Here we report on the realization of a new type of optical lattice with a hexagonal symmetry.
The lattice laser configuration allows for the generation of spin-dependent as well as spin-independent optical potentials by changing the polarizations of the beams. Our experimental setup gives us the full control over the internal degrees of freedom in the hyperfine ground-state manifold of ⁸⁷Rb. This enables us to prepare and to investigate multi-component systems in this type of lattice. We will report on important experimental aspects like the phase stabilization of the lattice beams.
The first results obtained in the spin-dependent lattice show rich prospects with respect to transport, interaction and entropy phenomena when mixtures of different spin-states are loaded in this lattice. The spin-independent lattice can be used to simulate the effects of geometrical frustration on spins in the quantum magnetism regime.