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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster II

Q 30.10: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster

Spectroscopy of BECs in Triangular Lattices — •Julian Struck, Parvis Soltan-Panahi, Georg Meineke, Christoph Becker, and Klaus Sengstock — Institut für Laser-Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

Ultracold atoms in optical lattices provide unique access to controllable many-body-systems, reaching from the weakly-interacting to the strongly-correlated regime. We have realized an experimental setup for the generation of a two-dimensional lattice with a non-square symmetry through the use of a three beam lattice. By changing the polarization of the lattice beams two different lattice types can be realized: a spin-independent triangular lattice and an spin dependent hexagonal lattice.
A one dimensional standing-wave lattice perpendicular to the two-dimensional lattice can be used to realize a three-dimensional periodic confinement.
Furthermore, our experimental setup allows control over the internal degrees of freedom in the hyperfine ground manifold of ⁸⁷ Rb. Thus we are able to study the dynamics of spinor condensates in the lattice.
Here we present the latest ideas and measurements at our experiment with special emphasize on spectroscopy methods for the detection and identification of e.g. ground state phases or number occupation on lattice sites, as well as spin dynamics on optical lattices.