Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superfluidity and collective properties of excitonic polaritons in
  gapped graphene in a microcavity   We predict the formation and superfluidity of polaritons in an optical
microcavity formed by excitons in gapped graphene embedded there and
microcavity photons. The Rabi splitting related to the creation of an exciton
in a graphene layer in the presence of the band gap is obtained. The analysis
of collective excitations as well as the sound velocity is presented. We show
that the superfluid density and temperature of the Kosterlitz-Thouless phase
transition are decreasing functions of the energy gap.

2
The categories of this paper are: math
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas