Rotating states for trapped bosons in an optical latticeE. Lundh
Department of Physics, Umeå University - SE-90187 Umeå, Sweden, EU
received 26 June 2008; accepted in final form 25 August 2008; published October 2008
published online 18 September 2008
Rotational states for trapped bosons in an optical lattice are studied in the framework of the Hubbard model. Critical frequencies are calculated and the main parameter regimes are identified. Transitions are observed from edge superfluids to vortex lattices with Mott insulating cores, and subsequently to lattices of interstitial vortices. The former transition coincides with the Mott transition. Changes in symmetry of the vortex lattices are observed as a function of lattice depth. Predictions for experimental signatures are presented.
03.75.Lm - Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations.
© EPLA 2008