Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of non-trivial topological electronic structure of
  orthorhombic SnSe   Topological electronic structures are key to the topological classification
of quantum materials and play an important role in their physical properties
and applications. Recently, SnSe has attracted great research interests due to
its superior thermoelectric performance. However, it's topological nature has
long been ignored. In this work, by combining synchrotron-based angle-resolved
photoemission spectroscopy and ab-initio calculations, we systematically
investigated the topological electronic structure of orthorhombic SnSe. By
identifying the continuous gap in the valence bands due to the band inversion
and the topological surface states on its (001) surface, we establish SnSe as a
strong topological insulator. Furthermore, we studied the evolution of the
topological electronic structure and propose the topological phase diagram in
SnSe1-xTex. Our work reveals the topological non-trivial nature of SnSe and
provides new understandings of its intriguing transport properties.

18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio