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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster Quantengase
Q 27.19: Poster
Tuesday, March 11, 2008, 16:30–19:00, Poster C2
Optical lattice with a staggered magnetic field — •G. Wirth1, A. Hemmerich1, L.-K. Lim2, and C. Morais Smith2 — 1Universitaet 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.