Nonlinear electric conductivity and THz-induced charge transport in graphene

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, refl...

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Bibliographic Details
Published in:New journal of physics 2021-06, Vol.23 (6), p.63047
Main Authors: Sato, Shunsuke A, Rubio, Angel
Format: Article
Language:English
Subjects:
Brillouin zones
Charge transport
Chemical potential
Depletion
Electric fields
Electrical resistivity
Field strength
Graphene
light-induced charge transport
nonlinear optics
Physics
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Summary: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 −1 , 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.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ac03d0