Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nonperturbative quasi-classical theory of the nonlinear electrodynamic
  response of graphene   An electromagnetic response of a single graphene layer to a uniform,
arbitrarily strong electric field $E(t)$ is calculated by solving the kinetic
Boltzmann equation within the relaxation-time approximation. The theory is
valid at low (microwave, terahertz, infrared) frequencies satisfying the
condition $\hbar\omega\lesssim 2E_F$, where $E_F$ is the Fermi energy. We
investigate the saturable absorption and higher harmonics generation effects,
as well as the transmission, reflection and absorption of radiation incident on
the graphene layer, as a function of the frequency and power of the incident
radiation and of the ratio of the radiative to scattering damping rates. We
show that the optical bistability effect, predicted in Phys. Rev. B 90, 125425
(2014) on the basis of a perturbative approach, disappears when the problem is
solved exactly. We show that, under the action of a high-power radiation
($\gtrsim 100$ kW/cm$^2$) both the reflection and absorption coefficients
strongly decrease and the layer becomes transparent.

18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph