Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-05-05
Physical Review A 84, 023637 (2011)
Physics
Condensed Matter
Quantum Gases
8 pages, 8 figures
Scientific paper
10.1103/PhysRevA.84.023637
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.
Anderson Brian P.
Blakie Blair P.
Bradley Alexander S.
Rooney S. J.
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