Controlled vortex-sound interactions in atomic Bose-Einstein condensates

Abstract

The dynamics of vortex in a trapped quasi-two-dimensional Bose-Einstein condensate (BEC), which produce vortex-sound interaction was discussed. It was observed that a vortex precession in a trapped quasi-2D BEC at low temperature emits dipolar radiation, which becomes modified into a spiral wave pattern due to the motion of the vortex. The results show that the vortex energy decays at a rate proportional to its acceleration squared and inversely proportional to the precession frequency. It was suggested that sound emission and reabsorption can be controlled by varying the depth of the dimple.