Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photon emission as a source of coherent behaviour of polaritons   We show that the combined effect of photon emission and Coulomb interactions
may drive an exciton-polariton system towards a dynamical coherent state, even
without phonon thermalization or any other relaxation mechanism. Exact
diagonalization results for a finite system (a multilevel quantum dot
interacting with the lowest energy photon mode of a microcavity) are presented
in support to this statement.

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The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin