Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ring dark solitons in microcavity polariton condensates   A ring dark soliton is a dark soltion occurring in higher dimensions. It is
still unknown in microcavity-polariton condensates due to its instability. We
find that a stable RDS cannot exist in a MPC without a defect. We then propose
a way to create a stable RDS in a MPC by adding a defect with a ring structure
to the system. A RDS pinned by the defect potential becomes stable. For various
pump powers, we also investigate the stable regime of the RDS by tuning the
strength and width of the defect potential. We conclude that the stable RDSs
can be obtained.

29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys