Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical probing in a bilayer dark-bright condensate system   We consider a bilayer system of two-dimensional Bose-Einstein-condensed
dipolar dark excitons (upper layer) and bright ones (bottom layer). We
demonstrate that the interlayer interaction leads to a mixing between
excitations from different layers. This mixing leads to the appearance of a
second spectral branch in the spectrum of bright condensate. The excitation
spectrum of the condensate of dark dipolar excitons then becomes optically
accessible during luminescence spectra measurements of the bright condensate,
which allows one to probe its kinetic properties. This approach is relevant for
experimental setups, where detection via conventional techniques remains
challenging; in particular, the suggested method is useful for studying dark
dipolar excitons in transition metal dichalcogenide monolayers.

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The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin