Macroscopic angular-momentum states of Bose-Einstein condensates in toroidal traps
International Centre for Theoretical Physics - I-34100, Trieste,
2 International School for Advanced Studies and Istituto Nazionale di Fisica della Materia - I-34014, Trieste, Italy
Accepted: 11 February 1999
We study the stability of a rotating repulsive-atom Bose-Einstein condensate in a toroidal trap. The resulting macroscopic angular-momentum states with integer vorticity l spread radially, lowering rotational energies. These states are robust against vorticity-lowering decays, with estimated metastability barriers capable of sustaining large angular momenta () for typical parameters. We identify the centrifugally squashed l-dependent density profile as a possible signature of condensate rotation and superfluidity.
PACS: 03.75.Fi – Phase coherent atomic ensembles; quantum condensation phenomena / 05.30.Jp – Boson systems / 32.80.Pj – Optical cooling of atoms; trapping
© EDP Sciences, 1999