Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic structures and theoretical modelling of two-dimensional
  group-VIB transition metal dichalcogenides   Atomically thin group-VIB transition metal dichalcogenides (TMDs) have
recently emerged as a new class of two-dimensional (2D) semiconductors with
extraordinary properties including the direct band gap in the visible frequency
range, the pronounced spin-orbit coupling, the ultra-strong Coulomb
interaction, and the rich physics associated with the valley degree of freedom.
These 2D TMDs exhibit great potentials for device applications and have
attracted vast interest for the exploration of new physics. 2D TMDs have
complex electronic structures which underlie their physical properties. Here we
review the bulk electronic structures in these new 2D materials as well as the
theoretical models developed at different levels, along which we sort out the
understandings on the origins of a variety of properties observed or predicted.

3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci