Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low temperature electron-phonon resonance in dc-current-biased
  two-dimensional electron systems   Effects of resonant acoustic phonon scattering on magnetoresistivity are
examined in two-dimensional electron systems at low temperatures by using a
balance-equation magnetotransport scheme direct controlled by the current. The
experimentally observed resonances in linear resistivity are shown to result
from the conventional bulk phonon modes in a GaAs-based system, without
invoking leaky interface phonons. Due to quick heating of electrons, phonon
resonances can be dramatically enhanced by a finite bias current. When the
electron drift velocity increases to the speed of sound, additional and
prominent phonon resonance peaks begin to emerge. As a result, remarkable
resistance oscillation and negative differential resistivity can appear in
nonlinear transport in a modest mobility sample at low temperatures, which is
in agreement with recent experiments.

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The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics