Issue
EPL
Volume 84, Number 1, October 2008
Article Number 10007
Number of page(s) 6
Section General
DOI http://dx.doi.org/10.1209/0295-5075/84/10007
Published online 18 September 2008
EPL, 84 (2008) 10007
DOI: 10.1209/0295-5075/84/10007

Rotating states for trapped bosons in an optical lattice

E. Lundh

Department of Physics, Umeå University - SE-90187 Umeå, Sweden, EU

Emil.Lundh@tp.umu.se

received 26 June 2008; accepted in final form 25 August 2008; published October 2008
published online 18 September 2008

Abstract
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.

PACS
03.75.Lm - Tunneling, Josephson effect, Bose-Einstein condensates in periodic potentials, solitons, vortices, and topological excitations.

© EPLA 2008