Quantized circular motion of a trapped Bose-Einstein condensate in laser beams: coherent rotation and vortices

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  • 11 November 1997
Abstract
We propose a scheme based on four traveling wave laser beams to transfer angular momentum to a trapped Bose-Einstein condensate. For a harmonic trapping potential the scheme is equivalent to a rotation of the trapping potential and results in a circular motion of the condensate around the trap center. This motion corresponds to a coherent superposition of vortex states with different quanta of circulation. Furthermore we analyse the possibility to create a pure vortex state of a trapped condensate. We show that for the proposed scheme an anharmonic trapping potential is essential for this purpose.

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