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Darmstadt 2008 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster Quantengase

Q 27.19: Poster

Dienstag, 11. März 2008, 16:30–19:00, Poster C2

Optical lattice with a staggered magnetic field — •G. Wirth1, A. Hemmerich1, L.-K. Lim2, and C. Morais Smith21Universitaet Hamburg, Institut fuer Laser-Physik, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Institute for Theoretical Physics, Utrecht University, 3508 TD Utrecht, The Netherlands

We show how an effective staggered magnetic field can be implemented in a two-dimensional bosonic square optical lattice via stimulated Raman scattering and discuss the phase diagram of this quantum system. Apart from the homogeneous superfluid and the Mott insulator, known to exist in the conventional Bose-Hubbard model, a novel kind of superfluid phase arises characterized by finite momentum and a staggered vortex lattice. Its characteristic momentum spectrum permits straight forward experimental detection of this phase.

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