Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Discovery of a two-dimensional topological insulator in SiTe   Two-dimensional (2D) topological insulators (TIs), a new state of quantum
matter, are promising for achieving the low-power-consuming electronic devices
owning to the remarkable robustness of their conducting edge states against
backscattering. Currently, the major challenge to further studies and possible
applications is the lack of suitable materials, which should be with high
feasibility of fabrication and sizeable nontrivial gaps. Here, we demonstrate
through first-principles calculations that SiTe 2D crystal is a promising 2D TI
with a sizeable nontrivial gap of 0.220 eV. This material is dynamically and
thermally stable. Most importantly, it could be easily exfoliated from its
three-dimensional superlattice due to the weakly bonded layered structure.
Moreover, strain engineering can effectively control its nontrivial gap and
even induce a topological phase transition. Our results provide a realistic
candidate for experimental explorations and potential applications of 2D TIs.

14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn