Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Z2 topological term, the global anomaly, and the two-dimensional
  symplectic symmetry class of Anderson localization   We discuss, for a two-dimensional Dirac Hamiltonian with random scalar
potential, the presence of a $Z_2$ topological term in the non-linear sigma
model encoding the physics of Anderson localization in the symplectic symmetry
class. The $Z_2$ topological term realizes the sign of the Pfaffian of a family
of Dirac operators. We compute the corresponding global anomaly, i.e., the
change in the sign of the Pfaffian by studying a spectral flow numerically.
This $Z_2$ topological effect can be relevant to graphene when the impurity
potential is long-ranged and, also, to the two-dimensional boundaries of a
three-dimensional lattice model of $Z_2$ topological insulators in the
symplectic symmetry class.

11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom