Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-vortex nucleation in a Bose-Einstein condensate by a spin-dependent
  rotating trap   A method to produce a spin-dependent rotating potential using near-resonant
circularly polarized laser beams is proposed. It is shown that half-quantum
vortices are nucleated in a spinor Bose-Einstein condensate with an
antiferromagnetic interaction. In contrast to the vortex nucleation in a scalar
BEC, the spin-vortex nucleation occurs at a low rotation frequency ($\simeq 0.1
\omega_\perp$ with $\omega_\perp$ being the radial trap frequency) in a short
nucleation time $\simeq 50$ ms without dissipation. A method for nondestructive
measurement of half-quantum vortices is discussed.

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The categories of this paper are: math-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: acc-phys