Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Interfacial-state coupling induced topological phase transitions in SnTe
  (110) thin film   A defining feature of topological insulating phases is symmetry-protected
interfacial Dirac states. SnTe is a representative topological crystalline
insulator, of which (110) thin films have two symmetry-unrelated valleys of
interfacial states. With the help of valley-contrasting couplings of
interfacial states, we design various two-dimensional topological phases in
(110) SnTe thin film systems. Our first-principles calculations demonstrate
that surface-state coupling strengths of two valleys independently vary with
the thickness of the thin film, leading to both two-dimensional topological
crystalline insulator and quantum spin Hall insulator. Most interestingly, by
constructing a nanoribbon array of SnTe thin film, edge-state couplings of
nanoribbons can further induce topological phase transition between the above
topological phases with high tunability, which offers multi-mode quantum
transport with potential use in electronic and spintronic devices.

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The categories of this paper are: astro-ph
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The categories of this paper are: hep-lat
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
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The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
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The categories of this paper are: physics
9
The categories of this paper are: nlin