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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.15: Poster

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

Bosonic Optical Lattice with a Staggered Magnetic Field — Georg Wirth, •Matthias Ölschläger, and Andreas Hemmerich — Institut für Laser-Physik, Universität Hamburg

Using a bichromatic light-shift potential a two-dimensional square optical lattice with a time-modulation term can be realized that introduces rotation with alternating directions in each plaquette. This scenario can be described by a Hubbard model with an additional staggered magnetic field. For bosons, besides the uniform superfluid and Mott insulating phases, known from the conventional Bose-Hubbard model, the zero-temperature phase diagram exhibits a novel kind of finite-momentum superfluid phase, characterized by quantized staggered rotational flux in each plaquette.

In addition to a brief physical motivation we present the experimental progress.