Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Moire bands in twisted double-layer graphene   A moire pattern is formed when two copies of a periodic pattern are overlaid
with a relative twist. We address the electronic structure of a twisted
two-layer graphene system, showing that in its continuum Dirac model the moire
pattern periodicity leads to moire Bloch bands. The two layers become more
strongly coupled and the Dirac velocity crosses zero several times as the twist
angle is reduced. For a discrete set of magic angles the velocity vanishes, the
lowest moire band flattens, and the Dirac-point density-of-states and the
counterflow conductivity are strongly enhanced.

8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th