Lookup NU author(s): Dr George Stagg,
Professor Nikolaos Proukakis,
Professor Carlo Barenghi
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Institute of Physics Publishing Ltd., 2017.
For re-use rights please refer to the publisher's terms and conditions.
Understanding quantum dynamics in a two-dimensional Bose-Einstein condensate (BEC) relies on understanding how vortices interact with each others microscopically and with local imperfections of the potential which confines the condensate. Within a system consisting of many vortices, the trajectory of a vortex-antivortex pair is often scattered by a third vortex, an effect previously characterised. However, the natural question remains as to how much of this effect is due to the velocity induced by this third vortex and how much is due to the density inhomogeneity which it introduces.In this work, we describe the various qualitative scenarios which occur when a vortex-antivortex pair interacts with a smooth density impurity whose profile is identical to that of a vortex but lacks the circulation around it.
Author(s): Griffin A, Stagg GW, Proukakis NP, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Journal of Physics B
Print publication date: 11/05/2017
Online publication date: 21/04/2017
Acceptance date: 21/04/2017
Date deposited: 25/05/2017
ISSN (print): 0953-4075
Publisher: Institute of Physics Publishing Ltd.
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