Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gallium Bismuth Halides GaBi-X2 (X= I, Br, Cl) Monolayers with Distorted
  Hexagonal Framework: Novel Room-Temperature Quantum Spin Hall Insulators   Quantum Spin Hall (QSH) insulators with a large topologically nontrivial bulk
gap are crucial for future applications of the QSH effect. Among these, group
III-V monolayers and their halides with chair structure (regular hexagonal
framework, RHF) were widely studied. Using first-principles calculations, we
propose a new structure model for the functionalized group III-V monolayers,
which consist of rectangular GaBi-X2 (X=I, Br, Cl) monolayers with a distorted
hexagonal framework (DHF). These structures have a much lower energy than the
GaBi-X2 monolayers with chair structure. Remarkably, the DHF GaBi-X2 monolayers
are all QSH insulators, which exhibit sizeable nontrivial band gaps ranging
from 0.17 eV to 0.39 eV. Those band gaps can be widely tuned by applying
different spin-orbit coupling (SOC) strengths, resulting in a distorted Dirac
cone.

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The categories of this paper are: dg-ga
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The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
22
The categories of this paper are: chao-dyn