Annihilation of vortex dipoles in an oblate Bose-Einstein condensate

Prabhakar, Shashi and Singh, RP and Gautam, S and Angom, D (2013) Annihilation of vortex dipoles in an oblate Bose-Einstein condensate. In: Journal of Physics B: Atomic, Molecular and Optical Physics, 46 (12). 125302_1-125302_9.

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Abstract

We theoretically explore the annihilation of vortex dipoles, generated when an obstacle moves through an oblate Bose-Einstein condensate, and examine the energetics of the annihilation event. We show that the grey soliton, which results from the vortex dipole annihilation, is lower in energy than the vortex dipole. We also investigate the annihilation events numerically and observe that annihilation occurs only when the vortex dipole overtakes the obstacle and comes closer than the coherence length. Furthermore, we find that noise reduces the probability of annihilation events. This may explain the lack of annihilation events in experimental realizations.

Item Type:	Journal Article
Publication:	Journal of Physics B: Atomic, Molecular and Optical Physics
Publisher:	IOP Publishing Ltd
Additional Information:	Copyright of this article belongs to IOP Publishing Ltd.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	06 Aug 2013 11:22
Last Modified:	06 Aug 2013 11:22
URI:	http://eprints.iisc.ac.in/id/eprint/46904

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