Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stationary quantum vortex street in a driven-dissipative quantum fluid
  of light   We investigate the formation of a new class of density-phase defects in a
resonantly driven 2D quantum fluid of light. The system bistability allows the
formation of low density regions containing density-phase singularities
confined between high density regions. We show that in 1D channels, an odd
(1-3) or even (2-4) number of dark solitons form parallel to the channel axis
in order to accommodate the phase constraint induced by the pumps in the
barriers. These soliton molecules are typically unstable and evolve toward
stationary symmetric or anti-symmetric arrays of vortex streets
straightforwardly observable in \emph{cw} experiments. The flexibility of this
photonic platform allows implementing more complicated potentials such as
maze-like channels, with the vortex streets connecting the entrances and thus
solving the maze.

5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin