paper

Vortex creation during magnetic trap manipulations of spinor Bose-Einstein condensates

arXiv:cond-mat/0603699 · doi:10.1103/PhysRevA.73.063615

Abstract

We investigate several mechanisms of vortex creation during splitting of a spinor BEC in a magnetic trap controlled by a pair of current carrying wires and bias magnetic fields. Our study is motivated by a recent MIT experiment on splitting BECs with a similar trap, where unexpected fork-like structure appeared in the interference fringes corresponding to interference of two condensates, one with and the other without a singly quantized vortex. It is well-known that in a spin-1 BEC in a quadrupole trap a doubly quantized vortex is produced topologically by a ``slow'' reversal of bias magnetic field . We find that in the magnetic trap considered it is also possible to produce a 4- and 1-quantized vortex in a spin-1 BEC. The latter is possible, for example, during the magnetic field switching-off process. We therefore provide a possible explanation for the unexpected interference patterns in the experiment. We also give an example of the creation of singly quantized vortices due to ``fast'' splitting, which is a possible alternative mechanism of the interference pattern.

16 pages, 8 figures (of reduced quality; original figures are available upon request: [email protected]); Comments to ver.2: calculations without gravity were added, several typos corrected

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