Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of a nematic spin vortex in an antiferromagnetic spin-1
  Bose-Einstein condensate   A spin-1 condensate with antiferromagnetic interactions supports nematic spin
vortices in the easy-plane polar phase. These vortices have a $2\pi$ winding of
the nematic director, with a core structure that depends on the quadratic
Zeeman energy. We characterize the properties of the nematic spin vortex in a
uniform quasi-two-dimensional system. We also obtain the vortex excitation
spectrum and use it to quantify its stability against dissociating into two
half-quantum vortices, finding a parameter regime where the nematic spin vortex
is dynamically stable. These results are supported by full dynamical
simulations.

3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin