Vortex Nucleation in a Stirred Bose-Einstein Condensate

Abstract

We studied the nucleation of vortices in a Bose-Einstein condensate stirred by a laser beam. We observed the vortex cores using time-of-flight absorption imaging. By varying the size of the stirrer, we observed either discrete resonances or a broad response as a function of the frequency of the stirrer's motion. Stirring beams small compared to the condensate size generated vortices below the critical rotation frequency for the nucleation of surface modes, suggesting a local mechanism of generation. In addition, we observed the centrifugal distortion of the condensate due to the rotating vortex lattice and found evidence for bent vortices.

References in corpus (2)

• Vortices in a trapped dilute Bose-Einstein condensate
• Stationary states of a rotating Bose-Einstein condensate: routes to vortex nucleation

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