Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of density on microwave-induced resistance oscillations in
  back-gated GaAs quantum wells   We report on microwave-induced resistance oscillations (MIROs) in a
tunable-density 30-nm-wide GaAs/AlGaAs quantum well. We find that the MIRO
amplitude increases dramatically with carrier density. Our analysis shows that
the anticipated increase in the effective microwave power and quantum lifetime
with density is not sufficient to explain the observed growth of the amplitude.
We further observe that the fundamental oscillation extrema move towards
cyclotron resonance with increasing density, which also contradicts theoretical
predictions. These findings reveal that the density dependence is not properly
captured by existing theories, calling for further studies.

16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg