Physics – Quantum Physics
Scientific paper
2006-05-15
Phys. Rev. Lett. 97, 110406 (2006)
Physics
Quantum Physics
5 pages, 5 figures
Scientific paper
10.1103/PhysRevLett.97.110406
Recently, the splitting of a topologically created doubly quantized vortex into two singly quantized vortices was experimentally investigated in dilute atomic cigar-shaped Bose-Einstein condensates [Y. Shin et al., Phys. Rev. Lett. 93, 160406 (2004)]. In particular, the dependency of the splitting time on the peak particle density was studied. We present results of theoretical simulations which closely mimic the experimental set-up. Contrary to previous theoretical studies, claiming that thermal excitations are the essential mechanism in initiating the splitting, we show that the combination of gravitational sag and time dependency of the trapping potential alone suffices to split the doubly quantized vortex in time scales which are in good agreement with the experiments. We also study the dynamics of the resulting singly quantized vortices which typically intertwine--especially, a peculiar vortex chain structure appears for certain parameter values.
Huhtamäki Jukka A. M.
Isoshima Tomoya
Mottonen Mikko
Pietilä Ville
Virtanen Sami M. M.
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