title: Ultrafast carrier dynamics in graphene under a high electric field.
abstract: We investigated ultrafast carrier dynamics in graphene with near-infrared transient absorption measurement after intense half-cycle terahertz pulse excitation. The terahertz electric field efficiently drives the carriers, inducing large transparency in the near-infrared region. Theoretical calculations using the Boltzmann transport equation quantitatively reproduce the experimental findings. This good agreement suggests that the intense terahertz field should promote a remarkable impact ionization process and increase the carrier density.
authors.affiliation: Department of Physics, Kyoto University, Kyoto 606-8502, Japan. tani@scphys.kyoto-u.ac.jp
authors.forename: Shuntaro
authors.initials: S
authors.lastname: Tani
authors.forename: François
authors.initials: F
authors.lastname: Blanchard
authors.forename: Koichiro
authors.initials: K
authors.lastname: Tanaka