2012/06/07 by Shuntaro Tani, Tani, Shuntaro, F. Blanchard +3
Engineering · Materials Science · Physics and Astronomy · #Terahertz technology and applications #Silicon Nanostructures and Photoluminescence #Semiconductor Quantum Structures and Devices
paper · pdf · doi:10.48550/arxiv.1206.1392
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 remarkable impact ioniza- tion process, which leads to suppression of optical phonon emission and results in efficient carrier transport in graphene.