Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Polaron-Polaritons in the Integer and Fractional Quantum Hall Regimes   Elementary quasi-particles in a two dimensional electron system can be
described as exciton-polarons since electron-exciton interactions ensures
dressing of excitons by Fermi-sea electron-hole pair excitations. A relevant
open question is the modification of this description when the electrons occupy
flat-bands and electron-electron interactions become prominent. Here, we
perform cavity spectroscopy of a two dimensional electron system in the
strong-coupling regime where polariton resonances carry signatures of strongly
correlated quantum Hall phases. By measuring the evolution of the polariton
splitting under an external magnetic field, we demonstrate the modification of
electron-exciton interactions that we associate with phase space filling at
integer filling factors and polaron dressing at fractional filling factors. The
observed non-linear behavior shows great promise for enhancing
polariton-polariton interactions.

10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex