Suppression of Kelvon-induced decay of quantized vortices in oblate Bose-Einstein condensates

S. J. Rooney, P. B. Blakie, B. P. Anderson, and A. S. Bradley
Phys. Rev. A 84, 023637 – Published 29 August 2011

Abstract

We study the Kelvin mode excitations on a vortex line in a three-dimensional trapped Bose-Einstein condensate at finite temperature. Our stochastic Gross-Pitaevskii simulations show that the activation of these modes can be suppressed by tightening the confinement along the direction of the vortex line, leading to a strong suppression in the vortex decay rate as the system enters a regime of two-dimensional vortex dynamics. As the system approaches the condensation transition temperature, we find that the vortex decay rate is strongly sensitive to dimensionality and temperature, observing a large enhancement for quasi-two-dimensional traps. Three-dimensional simulations of the recent vortex dipole decay experiment of Neely et al. [Phys. Rev. Lett. 104, 160401 (2010)] confirm two-dimensional vortex dynamics and predict a dipole lifetime consistent with experimental observations and suppression of Kelvon-induced vortex decay in highly oblate condensates.

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  • Received 4 May 2011

DOI:https://doi.org/10.1103/PhysRevA.84.023637

©2011 American Physical Society

Authors & Affiliations

S. J. Rooney1, P. B. Blakie1, B. P. Anderson2, and A. S. Bradley1

  • 1Jack Dodd Center for Quantum Technology, Department of Physics, University of Otago, Dunedin, New Zealand
  • 2College of Optical Sciences, University of Arizona, Tucson, Arizona 85721, USA

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Vol. 84, Iss. 2 — August 2011

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