Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Determining energy relaxation length scales in two-dimensional electron
  gases   We present measurements of the energy relaxation length scale $\ell$ in
two-dimensional electron gases (2DEGs). A temperature gradient is established
in the 2DEG by means of a heating current, and then the elevated electron
temperature $T_e$ is estimated by measuring the resultant thermovoltage signal
across a pair of deferentially biased bar-gates. We adapt a model by Rojek and
K\"{o}nig [Phys. Rev. B \textbf{90}, 115403 (2014)] to analyse the
thermovoltage signal and as a result extract $\ell$, $T_e$, and the power-law
exponent $\alpha_i$ for inelastic scattering events in the 2DEG. We show that
in high-mobility 2DEGs, $\ell$ can attain macroscopic values of several hundred
microns, but decreases rapidly as the carrier density $n$ is decreased. Our
work demonstrates a versatile low-temperature thermometry scheme, and the
results provide important insights into heat transport mechanisms in
low-dimensional systems and nanostructures. These insights will be vital for
practical design considerations of future nanoelectronic circuits.

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The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin