Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Second Harmonic Generation in Graphene   We report on theoretical study of second harmonic generation in graphene.
Phenomenological analysis based on symmetry arguments is carried out. It is
demontrated, that in ideal graphene samples second harmonic generation is
possible only if the radiation wave vector or its magnetic field is taken into
account. Microscopic theory is developed for the classical regime of radiation
interaction with electrons, where photon energy is much smaller than the charge
carriers characteristic energy. It is demonstrated, that the emitted radiation
can be strongly circularly polarized for the linearly polarized incident wave.

36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics