Abstract-Ultrafast Carrier Dynamics in Graphene under a High Electric Field

http://prl.aps.org/abstract/PRL/v109/i16/e166603

Shuntaro Tani^1,2,*, François Blanchard^2,3, and Koichiro Tanaka^1,2,3,†

¹Department of Physics, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
²CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan

³Institute for Integrated Cell-Material Sciences (WPI-iCeMS),Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan

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.

Terahertz radiation induced ballistic electron transport in graphene

Shuntaro Tani, François Blanchard, Koichiro Tanaka

http://arxiv.org/abs/1206.1392

(Submitted on 7 Jun 2012)

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.

Comments:	4 pages, 3 figures
Subjects:	Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
Cite as:	arXiv:1206.1392v1 [cond-mat.mes-hall]

Submission history

From: Shuntaro Tani [view email]
[v1] Thu, 7 Jun 2012 04:09:09 GMT (468kb)