Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detecting Josephson effect in the excitonic condensate by coherent
  emission of light   Coherent emission of light by a split excitonic Bose-Einstein condensate --
excitonic Josephson junction -- can be extremely sensitive to the Josephson
phase established across the junction. As a result of this, the emission can be
redistributed between different directions and even cancelled. The cases of the
dipole- and of the quadrupole-active excitons are considered.

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The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
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The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin