Nonlinear electric conductivity and THz-induced charge transport in graphene

Abstract

Based on the quantum master equation approach, the nonlinear electric conductivity of graphene is investigated under static electric fields for various chemical potential shifts. The simulation results show that, as the field strength increases, the effective conductivity is firstly suppressed, reflecting the depletion of effective carriers due to the large displacement in the Brillouin zone caused by the strong field. Then, as the field strength exceeds $1$~MV/m, the effective conductivity increases, overcoming the carrier depletion via the Landau--Zener tunneling process. Based on the nonlinear behavior of the conductivity, the charge transport induced by few-cycle THz pulses is studied to elucidate the ultrafast control of electric current in matter.

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Cited by in corpus (6)

• Light-induced emergent phenomena in 2D materials and topological materials
• Terahertz-induced high-order harmonic generation and nonlinear charge transport in graphene
• Atomic real-space perspective of light-field-driven currents in graphene
• Unexpected linear conductivity in Landau-Zener model: limitations and improvements of the relaxation time approximation in the quantum master equation
• An experimental scheme for determining the Berry phase in two-dimensional quantum materials with a flat band
• Non-linear photoconductivity of strongly driven graphene