Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-activated transport of strongly interacting two-dimensional holes in
  GaAs   We report on the transport measurements of two-dimensional holes in GaAs
field effect transistors with record low densities down to 7*10^8 cm^{-2}.
Remarkably, such a dilute system (with Fermi wavelength approaching 1
micrometer) exhibits a non-activated conductivity that grows with temperature
following a power law. We contrast it with the activated transport obtained
from measuring more disordered samples, and discuss possible transport
mechanisms in this strongly-interacting regime.

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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph