Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-dimensional electron gas as a sensitive noise detector   The dc voltage observed at low-temperatures in a 2D electron sample $without$
external excitation is accounted by the Schottky contact rectification of the
noise generated in the measuring circuit. The rectified voltage is shown to
depend on the asymmetry of the contact pair. The dependence of the rectified
voltage on the noise amplitude first follows the trivial quadratic law, then
exhibits a nearly linear behavior, and, finally, levels-off.

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The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int