Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent back-scattering near the two-dimensional metal-insulator
  transition   We have studied corrections to conductivity due to the coherent
backscattering in low-disordered two-dimensional electron systems in silicon
for a range of electron densities including the vicinity of the metal-insulator
transition, where the dramatic increase of the spin susceptibility has been
observed earlier. We show that the corrections, which exist deeper in the
metallic phase, weaken upon approaching to the transition and practically
vanish at the critical density, thus suggesting that the localization is
suppressed near and at the transition even in zero field.

28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
2
The categories of this paper are: math
18
The categories of this paper are: econ