Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Metal-Insulator Transition in Graphene on Boron Nitride   Electrons in graphene aligned with hexagonal boron nitride are modelled by
Dirac fermions in a correlated random-mass landscape subject to a scalar- and
vector-potential disorder. We find that the system is insulating in the
commensurate phase since the average mass deviates from zero. At the transition
the mean mass is vanishing and electronic conduction in a finite sample can be
described by a critical percolation along zero-mass lines. In this case
graphene at the Dirac point is in a critical state with the conductivity
$\sqrt{3}e^2/h$. In the incommensurate phase the system behaves as a symplectic
metal.

29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th