Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2003-03-13
Phys. Rev. A 68, 023611 (2003)
Physics
Condensed Matter
Soft Condensed Matter
4 pages, 3 figures (to be published in PRA)
Scientific paper
10.1103/PhysRevA.68.023611
The stability of doubly quantized vortices in dilute Bose-Einstein condensates of 23Na is examined at zero temperature. The eigenmode spectrum of the Bogoliubov equations for a harmonically trapped cigar-shaped condensate is computed and it is found that the doubly quantized vortex is spectrally unstable towards dissection into two singly quantized vortices. By numerically solving the full three-dimensional time-dependent Gross-Pitaevskii equation, it is found that the two singly quantized vortices intertwine before decaying. This work provides an interpretation of recent experiments [A. E. Leanhardt et al. Phys. Rev. Lett. 89, 190403 (2002)].
Isoshima Tomoya
Machida Kazushige
Mizushima Takeshi
Mottonen Mikko
Salomaa Martti M.
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