Terahertz-induced high-order harmonic generation and nonlinear charge transport in graphene

Abstract

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.

References in corpus (5)

• The electronic properties of graphene
• Microscopic theory for the light-induced anomalous Hall effect in graphene
• Plasmon-assisted high-harmonic generation in graphene
• High harmonic generation in undoped graphene: Interplay of inter- and intraband dynamics
• Electrical tunability of terahertz nonlinearity in graphene

Cited by in corpus (5)

• Ellipticity control of terahertz high-harmonic generation in a Dirac semimetal
• Revealing Ultrafast Phonon Mediated Inter-Valley Scattering through Transient Absorption and High Harmonic Spectroscopies
• Universality in odd-even harmonic generation and application in terahertz waveform sampling
• Population inversion and ultrafast terahertz nonlinearity of transient Dirac fermions in Cd${}_3$As${}_2$
• Terahertz third-harmonic generation of lightwave driven Weyl fermions far from equilibrium