Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Realizing robust large-gap quantum spin Hall state in 2D HgTe monolayer
  on insulating substrate   Although many possible two-dimensional (2D) topological insulators (TIs) have
been predicted in recent years, there is still lack of experimentally
realizable 2D TI. Through first-principles and tight-binding simulations, we
found an effective way to stabilize the robust quantum spin Hall state with a
large nontrivial gap of 227 meV in 2D honeycomb HgTe monolayer by the
Al$_2$O$_3$(0001) substrate. The band topology originates from the band
inversion between the $s-$like and $p-$like orbitals that are contributed
completely by the Hg and Te atoms, so the quantized edge states are restricted
within the honeycomb HgTe monolayer. Meanwhile, the strong interaction between
HgTe and Al$_2$O$_3$(0001) ensures high stability of the atomic structure.
Therefore, the TI states may be realized in HgTe/Al$_2$O$_3$(0001) at high
temperature.

30
The categories of this paper are: q-alg
2
The categories of this paper are: math
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess