Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bismuthylene Monolayer: A Promising Quantum Spin Hall Insulator with
  Large Band Gaps   By means of first-principles calculations, we predict a new 2D QSH insulator
in the porous allotrope of Bismuth monolayer, bismuthylene, its dynamics
stability being confirmed by phonon spectrum and molecular dynamics
simulations. The analyses of electronic structures reveal that it is a native
QSH state with a gap much as large as 0.29 eV at the {\Gamma} point, which is
larger than the buckled (0.2 eV) and flattened (0.2 eV) bismuth, Bi4Br4 (0.18
eV), as well as stanene (0.1 eV), also more stable energetically than these
systems. Interestingly, the bismuthylene has tunable band gaps and nontrivial
band topology under strains within -6 - 5 % and electric fields up to 0.8
eV/{\AA}. Furthermore, a tight-binding model is constructed to explain the
low-energy physics behind band topology induced by spin-orbit coupling. We also
propose a quantum well by sandwiching bismuthylene between two BN sheets and
reveals that this structure remains topologically nontrivial with a sizeable
band gap. This findings on QSH effect of bismuthylene provide a viable platform
in new generation of dissipationless electronics and spintronics devices.

17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
1
The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
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
23
The categories of this paper are: solv-int
2
The categories of this paper are: math