Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamical mass generation via space compactification in graphene   Fermions in a graphene sheet behave like massless particles. We show that by
folding the sheet into a tube they acquire non-zero effective mass as they move
along the tube axis. That is, changing the space topology of graphene from 2D
to 1D (space compactification) changes the 2D massless problem into an
effective massive 1D problem. The size of the resulting mass spectrum depends
on the quantized azimuthal frequency and its line spacing is proportional to
the inverse of the tube diameter.

26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat