Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A unified theory for excited-state, fragmented, and equilibrium-like
  Bose condensation in pumped photonic many-body systems   We derive a theory for Bose condensation in nonequilibrium steady states of
bosonic quantum gases that are coupled both to a thermal heat bath and to a
pumped reservoir (or gain medium), while suffering from loss. Such a scenario
describes photonic many-body systems such as exciton-polariton gases. Our
analysis is based on a set of kinetic equations for a gas of noninteracting
bosons. By identifying a dimensionless scaling parameter controlling the boson
density, we derive a sharp criterion for which system states become selected to
host a macroscopic occupation. We show that with increasing pump power, the
system generically undergoes a sequence of nonequilibrum phase transitions. At
each transition a state either becomes or ceases to be Bose selected (i.e. to
host a condensate): The state which first acquires a condensate when the
pumping exceeds a threshold is the one with the largest ratio of pumping to
loss. This intuitive behavior resembles simple lasing. In the limit of strong
pumping, the coupling to the heat bath becomes dominant so that eventually the
ground state is selected, corresponding to equilibrium(-like) Bose
condensation. For intermediate pumping strengths, several states become
selected giving rise to fragmented nonequilibrium Bose condensation. We compare
these predictions to experimental results obtained for excitons polaritons in a
double-pillar structure [Phys. Rev. Lett. 108, 126403 (2012)] and find good
agreement. Our theory, moreover, predicts that the reservoir occupation is
clamped at a constant value whenever the system hosts an odd number of Bose
condensates.

25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: mtrl-th
2
The categories of this paper are: math