Macroscopic angular-momentum states of Bose-Einstein condensates in toroidal traps

Year: 1999

Authors: Benakli M., Raghavan S., Smerzi A., Fantoni S., Shenoy S.R.

Autors Affiliation: Abdus Salaam Int Ctr Theoret Phys, I-34100 Trieste, Italy; Scuola Int Super Studi Avanzati, I-34014 Trieste, Italy; Ist Nazl Fis Mat, I-34014 Trieste, Italy.

Abstract: 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 (l less than or similar to 10) for typical parameters. We identify the centrifugally squashed l-dependent density profile as a possible signature of condensate rotation and superfluidity.

Journal/Review: EUROPHYSICS LETTERS

Volume: 46 (3)      Pages from: 275  to: 281

KeyWords: Collective Excitations; Ground-state; Gas; Atoms; Vortices; Bosons
DOI: 10.1209/epl/i1999-00256-8

Citations: 27
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