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Rotating states for trapped bosons in an optical lattice

E. Lundh

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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

Subjects

Quantum gases, liquids and solids

Dates

Issue 1 (October 2008)

Received 26 June 2008, accepted for publication 25 August 2008

Published 18 September 2008



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