Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dipolar excitons offer a rich playground for both design of novel
  optoelectronic devices and fundamental many-body physics   Dipolar excitons offer a rich playground for both design of novel
optoelectronic devices and fundamental many-body physics. Wide GaN/(AlGa)N
quantum wells host a new and promising realization of dipolar excitons. We
demonstrate the in-plane confinement and cooling of these excitons, when
trapped in the electrostatic potential created by semitransparent electrodes of
various shapes deposited on the sample surface. This result is a prerequisite
for the electrical control of the exciton densities and fluxes, as well for
studies of the complex phase diagram of these dipolar bosons at low
temperature.

13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
9
The categories of this paper are: nlin
19
The categories of this paper are: eess