Ultrafast carrier dynamics in graphene under a high electric field

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 calculati...

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Bibliographic Details
Published in:Physical review letters 2012-10, Vol.109 (16), p.166603-166603, Article 166603
Main Authors: Tani, Shuntaro, Blanchard, François, Tanaka, Koichiro
Format: Article
Language:English
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.109.166603