Rotation of a Bose-Einstein Condensate held under a toroidal trap

Details Rotation of a Bose-Einstein Condensate held under a toroidal trap Rotation of a Bose-Einstein Condensate held under a toroidal trap

2009-11-04

arxiv.org/abs/0911.0764v2

Physics

Condensed Matter

Quantum Gases

Scientific paper

The aim of this paper is to perform a numerical and analytical study of a rotating Bose Einstein condensate placed in a harmonic plus Gaussian trap, following the experiments of \cite{bssd}. The rotational frequency $\Omega$ has to stay below the trapping frequency of the harmonic potential and we find that the condensate has an annular shape containing a triangular vortex lattice. As $\Omega$ approaches $\omega$, the width of the condensate and the circulation inside the central hole get large. We are able to provide analytical estimates of the size of the condensate and the circulation both in the lowest Landau level limit and the Thomas-Fermi limit, providing an analysis that is consistent with experiment.

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