Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Robust midgap states in band-inverted junctions under electric and
  magnetic fields   Several IV-VI semiconductor compounds made of heavy atoms, such as
Pb$_{1-x}$Sn$_{x}$Te, may undergo band-inversion at the $L$ point of the
Brillouin zone upon variation of their chemical composition. This inversion
gives rise to topologically distinct phases, characterized by a change in a
topological invariant. In the framework of the $\mathbf{k}\cdot\mathbf{p}$
theory, band-inversion can be viewed as a change of sign of the fundamental
gap. A two-band model within the envelope-function approximation predicts the
appearance of midgap interface states with Dirac cone dispersions in
band-inverted junctions, namely, when the gap changes sign along the growth
direction. We present a thorough study of these interface electron states in
the presence of crossed electric and magnetic fields, the electric field being
applied along the growth direction of a band-inverted junction. We show that
the Dirac cone is robust and persists even if the fields are strong. In
addition, we point out that Landau levels of electron states lying in the
semiconductor bands can be tailored by the electric field. Tunable devices are
thus likely to be realizable exploiting the properties studied herein.

24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom