Dynamic and energetic stabilization of persistent currents in Bose-Einstein condensates

Law, K. J. H., Neely, T. W., Kevrekidis, P. G., Anderson, B. P., Bradley, A. S. and Carretero-González, R. (2014) Dynamic and energetic stabilization of persistent currents in Bose-Einstein condensates. Physical Review A (Atomic, Molecular and Optical Physics), 89 5: 053606-1-053606-8. doi:10.1103/PhysRevA.89.053606

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Author Law, K. J. H.
Neely, T. W.
Kevrekidis, P. G.
Anderson, B. P.
Bradley, A. S.
Carretero-González, R.
Title Dynamic and energetic stabilization of persistent currents in Bose-Einstein condensates
Journal name Physical Review A (Atomic, Molecular and Optical Physics)   Check publisher's open access policy
ISSN 1094-1622
1050-2947
1538-4446
Publication date 2014-05-09
Year available 2014
Sub-type Article (original research)
DOI 10.1103/PhysRevA.89.053606
Open Access Status File (Publisher version)
Volume 89
Issue 5
Start page 053606-1
End page 053606-8
Total pages 8
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2015
Language eng
Formatted abstract
We study conditions under which vortices in a highly oblate harmonically trapped Bose-Einstein condensate (BEC) can be stabilized due to pinning by a blue-detuned Gaussian laser beam, with particular emphasis on the potentially destabilizing effects of laser beam positioning within the BEC. Our approach involves theoretical and numerical exploration of dynamically and energetically stable pinning of vortices with winding number up to S=6, in correspondence with experimental observations. Stable pinning is quantified theoretically via Bogoliubov-de Gennes excitation spectrum computations and confirmed via direct numerical simulations for a range of conditions similar to those of experimental observations. The theoretical and numerical results indicate that the pinned winding number, or equivalently the winding number of the superfluid current about the laser beam, decays as a laser beam of fixed intensity moves away from the BEC center. Our theoretical analysis helps explain previous experimental observations and helps define limits of stable vortex pinning for future experiments involving vortex manipulation by laser beams.
Keyword Vortices
Systems
Bose-Einstein condensate (BEC)
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article number 053606

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Non HERDC
 
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Created: Thu, 08 Jan 2015, 17:56:36 EST by Tyler Neely on behalf of Physics