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- W2536098192 abstract "In their recent Letter [1], Huhtamaki et al. theoretically investigated the splitting of a topologically imprinted doubly charged vortex in to two singly charged vortices as occurring in a dilute atomic Bose-Einstein conden sate. They compare the results of simulation with recent experiment [2] and show that the combination of gravitational sag and the time dependence of the trapping potential alone are enough to explain the observed splitting times. In particular, the numerically obtained dependence of the decay time on the peak condensate density fits well the experimental data. Based on this agreement the authors of Ref. [1] claim that, contrary to previous theoretical results [3], the thermal excitations play no role in the experiment. We are going to show in this Comment that there is no conflict between explanations in Ref. [1] and [3]. In fact, a number of thermal (uncondensed) atoms appears in the system while disturbing the gas. They continue to appear afterwords during the decay of the vortex (i.e., when the separation between two cores of singly quantized vortices is slowly increasing). The overall number of uncondensed atoms remains approximately on the level of 20%, which is already at the edge of experimental detection capabilities. However, the uncondensed atoms do not form the broad cloud allowing the identification by fitting to a bimodal distribution - they are rather located in the core of the vortex and therefore are harder to detect. [1] J.A.M. Huhtamaki et al., Phys. Rev. Lett. 97, 110406 (2006) [2] Y. Shin et al., Phys. Rev. Lett. 93, 160406 (2004) [3] K. Gawryluk, M. Brewczyk, and K. Rzazewski, J. Phys. B 39, L225 (2006)" @default.
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- W2536098192 date "2008-03-14" @default.
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- W2536098192 title "Comment on Splitting Times of Doubly Quantized Vortices in Dilute Bose-Einstein Condensates" @default.
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