Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topological electronic states and thermoelectric transport at phase
  boundaries in single-layer WSe$_2$: An effective Hamiltonian theory   Monolayer transition metal dichalcogenides in the distorted octahedral
1T$^\prime$ phase exhibit a large bulk bandgap and gapless boundary states,
which is an asset in the ongoing quest for topological electronics. In
single-layer tungsten diselenide (WSe$_2$), the boundary states have been
observed at well ordered interfaces between 1T$^\prime$ and semiconducting (1H)
phases. This paper proposes an effective 4-band theory for the boundary states
in single-layer WSe$_2$,describing a Kramers pair of in-gap states as well as
the behaviour at the spectrum termination points on the conduction and valence
bands of the 1T$^\prime$ phase. The spectrum termination points determine the
temperature and chemical potential dependences of the ballistic conductance and
thermopower at the phase boundary. Notably, the thermopower shows an ambipolar
behaviour, changing the sign in the bandgap of the 1T$^\prime$ - WSe$_2$ and
reflecting its particle-hole asymmetry. The theory establishes a link between
the bulk band structure and ballistic boundary transport in single-layer
WSe$_2$ and is applicable to a range of related topological materials.

36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom