Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Backscattering in a 2D topological insulator and conductivity of a 2D
  strip   A strip of 2D HgTe topological insulator is studied. The same-spin edge
states in ideal system propagate in opposite directions on different sides of
the strip and do not mix by tunneling. Impurities, edge irregularities, and
phonons produce transitions between the contra-propagating edge states on
different edges. This backscattering determines the conductivity of an
infinitely long strip. It is found that the conductivity exponentially grows
with the strip width. The conductivity at finite temperature is determined
within the framework of the kinetic equation. In the same approximation the
non-local resistance coefficients of 4-terminal strip are found. At low
temperature the localization occurs and 2-terminal conductance of long wire
vanishes, but with the exponentially long (with respect to the strip width)
localization length. The transition temperature between kinetic and
localization behaviors has been found.

1
The categories of this paper are: cs
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con