Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical properties of graphene: the Fermi liquid approach   Optical properties of two-dimensional massless Dirac fermions are considered
by the formalism of pseudospin precession equations which provides an easy and
natural semiphenomenological way to include correlation effects. It is shown
that the latter are negligible, with the only assumption that the system under
consideration is normal Fermi liquid. This result probably explains recent
experimental data on the universal optical conductivity of graphene (Nair R. R.
et al, Science 320 (2008) 1308).

22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio