Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bloch-Gr\"uneisen nonlinearity of electron transport in GaAs/AlGaAs
  heterostructures   We report on nonlinear transport measurements in a two-dimensional electron
gas hosted in GaAs/AlGaAs heterostructures. Upon application of direct current,
the low-temperature differential resistivity acquires a positive correction,
which exhibits a pronounced maximum followed by a plateau. With increasing
temperature, the nonlinearity diminishes and disappears. These observations can
be understood in terms of a crossover from the Bloch-Gr\"uneisen regime to the
quasielastic scattering regime as the electrons are heated by direct current.
Calculations considering the interaction of electrons with acoustic phonons
provide a reasonable description of our experimental findings.

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The categories of this paper are: physics
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The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
16
The categories of this paper are: stat
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The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: q-fin