Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Half-quantum vortex and d-soliton in Sr$_2$RuO$_4$   Assuming that the superconductivity in Sr$_2$RuO$_4$ is described by a planar
p-wave order parameter, we consider possible topological defects in
Sr$_2$RuO$_4$. In particular, it is shown that both of the ${\hat d}$-soliton
and half-quantum vortex can be created in the presence of the magnetic field
parallel to the $a$-$b$ plane. We discuss how one can detect the ${\hat
d}$-soliton and half-quantum vortex experimentally.

27
The categories of this paper are: comp-gas
25
The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex