Phases of a rotating Bose-Einstein condensate with anharmonic confinement

Details Phases of a rotating Bose-Einstein condensate with anharmonic confinement Phases of a rotating Bose-Einstein condensate with anharmonic confinement

2004-01-16

arxiv.org/abs/cond-mat/0401292v1

Phys. Rev. A, 69 (2004) 053619

Physics

Condensed Matter

8 pages, 6 figures

Scientific paper

10.1103/PhysRevA.69.053619

We examine an effectively repulsive Bose-Einstein condensate of atoms that rotates in a quadratic-plus-quartic potential. With use of a variational method we identify the three possible phases of the system (multiple quantization, single quantization, and a mixed phase) as a function of the rotational frequency of the gas and of the coupling constant. The derived phase diagram is shown to be universal and the continuous transitions to be exact in the limit of weak coupling and small anharmonicity. The variational results are found to be consistent with numerical solutions of the Gross-Pitaevskii equation.

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