Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surface-edge state and half quantized Hall conductance in topological
  insulators   We propose a surface-edge state theory for half quantized Hall conductance of
surface states in topological insulators. The gap opening of a single Dirac
cone for the surface states in a weak magnetic field is demonstrated. We find a
new surface state resides on the surface edges and carries chiral edge current,
resulting in a half-quantized Hall conductance in a four-terminal setup. We
also give a physical interpretation of the half quantized conductance by
showing that this state is the product of splitting of a boundary bound state
of massive Dirac fermions which carries a conductance quantum.

27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an