Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graphene supports the propagation of subwavelength optical solitons   We study theoretically nonlinear propagation of light in a graphene
monolayer. We show that the large intrinsic nonlinearity of graphene at optical
frequencies enables the formation of quasi one-dimensional self-guided beams
(spatial solitons) featuring subwavelength widths at moderate electric-field
peak intensities. We also demonstrate a novel class of nonlinear self-confined
modes resulting from the hybridization of surface plasmon polaritons with
graphene optical solitons.

6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph