Thermally induced instability of a doubly quantized vortex in a Bose-Einstein condensate

Abstract

We study the instability of a doubly quantized vortex topologically imprinted on ${}^{23}$Na condensate, as reported in recent experiment [Phys. Rev. Lett. \textbf{93}, 160406 (2004)]. We have performed numerical simulations using three-dimensional Gross-Pitaevskii equation with classical thermal noise. Splitting of a doubly quantized vortex turns out to be a process that is very sensitive to the presence of thermal atoms. We observe that even ve ry small thermal fluctuations, corresponding to 10 to 15% of thermal atoms, ca use the decay of doubly quantized vortex into two singly quantized vortices in tens of milliseconds. As in the experiment, the lifetime of doubly quantized vortex i s a monotonic function of the interaction strength.

4 pages, 5 figures

References in corpus (1)

• Dynamical Instability of a Doubly Quantized Vortex in a Bose-Einstein condensate

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