Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dirac-screening stabilized surface-state transport in a topological
  insulator   We report magnetotransport studies on a gated strained HgTe device. This
material is a threedimensional topological insulator and exclusively shows
surface state transport. Remarkably, the Landau level dispersion and the
accuracy of the Hall quantization remain unchanged over a wide density range
($3 \times 10^{11} cm^{-2} < n < 1 \times 10^{12} cm^{-2}$). This implies that
even at large carrier densities the transport is surface state dominated, where
bulk transport would have been expected to coexist already. Moreover, the
density dependence of the Dirac-type quantum Hall effect allows to identify the
contributions from the individual surfaces. A $k \cdot p$ model can describe
the experiments, but only when assuming a steep band bending across the regions
where the topological surface states are contained. This steep potential
originates from the specific screening properties of Dirac systems and causes
the gate voltage to influence the position of the Dirac points rather than that
of the Fermi level.

31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat