Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Matter-wave gap vortices in optical lattices   We predict the existence of spatially localized nontrivial topological states
of the Bose-Einstein condensate with repulsive atomic interactions confined by
an optical lattice. These nonlinear localized states, matter-wave gap vortices,
possess a phase dislocation and exist in the gaps of the matter-wave bandgap
spectrum due to the Bragg scattering. We discuss the structure, stability, and
formation dynamics of the gap vortices in the case of two-dimensional optical
lattices.

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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
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The categories of this paper are: econ