Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Edge states of hydrogen terminated monolayer materials: silicene,
  germanene and stanene ribbons   We investigate the energy dispersion of the edge states in zigzag silicene,
germanene and stanene nanoribbons with and without hydrogen termination based
on a multi-orbital tight-binding model. Since the low buckled structures are
crucial for these materials, both the $\pi$ and $\sigma$ orbitals have a strong
influence on the edge states, different from the case for graphene nanoribbons.
The obtained dispersion of helical edge states is nonlinear, similar to that
obtained by first-principles calculations. On the other hand, the dispersion
derived from the single-orbital tight-binding model is always linear.
Therefore, we find that the non-linearity comes from the multi-orbital effects,
and accurate results cannot be obtained by the single-orbital model but can be
obtained by the multi-orbital tight-binding model. We show that the
multi-orbital model is essential for correctly understanding the dispersion of
the edge states in tetragen nanoribbons with a low buckled geometry.

20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
2
The categories of this paper are: math