Annihilation of vortex dipoles in an Oblate Bose-Einstein Condensate

Details Annihilation of vortex dipoles in an Oblate Bose-Einstein Condensate Annihilation of vortex dipoles in an Oblate Bose-Einstein Condensate

2011-10-24

arxiv.org/abs/1110.5226v2

Physics

Atomic and Molecular Clusters

7 pages and 6 figures

Scientific paper

We theoretically explore the annihilation of vortex dipole, generated when an obstacle moves through a condensate, in an oblate Bose-Einstein Condensate and the possible reasons for the annihilation. We show that the grey soliton, which results from vortex dipole annihilation, is lower in energy than the vortex dipole. We also investigate the annihilation events numerically and observe annihilation occurs only when the vortex dipole overtake the obstacle. Further more, we find that the adding noise reduces the probability of annihilation events. This may explain the lack of annihilation events in experimental realizations.

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