Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: THz-induced high-order harmonic generation and nonlinear charge
  transport in graphene   We theoretically study the THz-induced high-order harmonic generation (HHG)
and nonlinear electric transport in graphene based on the quantum master
equation with the relaxation time approximation. To obtain microscopic insight
into the phenomena, we compare the results of the fully dynamical calculations
with those under a quasi-static approximation, where the electronic system is
approximated as a nonequilibrium steady state. As a result, we find that the
THz-induced electron dynamics in graphene can be accurately modeled with the
nonequilibrium steady-state at each instance. The population distribution
analysis further clarifies that the THz-induced HHG in graphene originates from
the reduction of effective conductivity due to a large displacement of
electrons in the Brillouin zone. By comparing the present nonequilibrium
picture with a thermodynamic picture, we explore the role of the nonequilibrium
nature of electron dynamics on the extremely nonlinear optical and transport
phenomena in graphene.

18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys