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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.46: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Engineering band structures for fermions in a triangular optical lattice — Nick Fläschner, •Dominik Vogel, Frieder Fröbel, Jasper Simon Krauser, Jannes Heinze, Christof Weitenberg, Klaus Sengstock, and Christoph Becker — Universität Hamburg, Institut für Laserphysik, Germany

Quantum gases in optical lattices offer a wide range of applications for quantum simulation due to widely tunable lattice and atomic interaction parameters. In this poster, we discuss experimental aspects and recent results of our setup for fermionic 40K in a far detuned triangular lattice. In particular, we report on high resolution spectroscopy with full momentum resolution, conducted via modulating the lattice depth. This method permits us to accurately extract the full two dimensional band structure. We present further how the band structure can be modified over a wide range of parameters by modulating the phases of the lattice beams. These parameters include the signs and the complex phases of the tunneling matrix elements, as well as controlling different bonds individually. In combination, these techniques form a versatile toolkit for precisely engineering band structures, creating artificial gauge fields and enabling future studies of interacting fermionic mixtures in non-cubic optical lattices.