Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electric Field Effect in Atomically Thin Carbon Films   We report a naturally-occurring two-dimensional material (graphene that can
be viewed as a gigantic flat fullerene molecule, describe its electronic
properties and demonstrate all-metallic field-effect transistor, which uniquely
exhibits ballistic transport at submicron distances even at room temperature.

16
The categories of this paper are: stat
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con