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

K. J H Law, T. W. Neely, P. G. Kevrekidis, Brian P Anderson, A. S. Bradley, R. Carretero-González

Research output: Contribution to journalArticle

5 Citations (Scopus)

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.

Original languageEnglish (US)
Article number053606
JournalPhysical Review A
Volume89
Issue number5
DOIs
StatePublished - May 9 2014

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Bose-Einstein condensates
stabilization
laser beams
vortices
direct numerical simulation
positioning
manipulators
decay
excitation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

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

Dynamic and energetic stabilization of persistent currents in Bose-Einstein condensates. / Law, K. J H; Neely, T. W.; Kevrekidis, P. G.; Anderson, Brian P; Bradley, A. S.; Carretero-González, R.

In: Physical Review A, Vol. 89, No. 5, 053606, 09.05.2014.

Research output: Contribution to journalArticle

Law, KJH, Neely, TW, Kevrekidis, PG, Anderson, BP, Bradley, AS & Carretero-González, R 2014, 'Dynamic and energetic stabilization of persistent currents in Bose-Einstein condensates', Physical Review A, vol. 89, no. 5, 053606. https://doi.org/10.1103/PhysRevA.89.053606
Law, K. J H ; Neely, T. W. ; Kevrekidis, P. G. ; Anderson, Brian P ; Bradley, A. S. ; Carretero-González, R. / Dynamic and energetic stabilization of persistent currents in Bose-Einstein condensates. In: Physical Review A. 2014 ; Vol. 89, No. 5.
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