Explicit expressions for the topological defects of spinor Bose-Einstein condensates

Details Explicit expressions for the topological defects of spinor Bose-Einstein condensates Explicit expressions for the topological defects of spinor Bose-Einstein condensates

2005-10-27

arxiv.org/abs/cond-mat/0510750v2

J. Phys. A: Math. Gen. 39, 7423 (2006)

Physics

Condensed Matter

Other Condensed Matter

17 pages, partly rewritten to improve clarity, conclusions unchanged

Scientific paper

10.1088/0305-4470/39/23/017

In this paper we first derive a general method which enables one to create expressions for vortices and monopoles. By using this method we construct several order-parameters describing the vortices and monopoles of Bose-Einstein condensates with hyperfine spin F=1 and F=2. We concentrate on defects which are topologically stable in the absence of an external magnetic field. In particular we show that in a ferromagnetic condensate there can be a vortex which does not produce any superfluid flow. We also point out that the order-parameter space of the cyclic phase of F=2 condensate consists of two disconnected sets. Finally we examine the effect of an external magnetic field on the vortices of a ferromagnetic F=1 condensate and discuss the experimental preparation of a vortex in this system.

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