The ultrafast dynamics and conductivity of photoexcited graphene at different Fermi energies.

ABSTRACT: For many of the envisioned optoelectronic applications of graphene, it is crucial to understand the subpicosecond carrier dynamics immediately following photoexcitation and the effect of photoexcitation on the electrical conductivity-the photoconductivity. Whereas these topics have been studied using various ultrafast experiments and theoretical approaches, controversial and incomplete explanations concerning the sign of the photoconductivity, the occurrence and significance of the creation of additional electron-hole pairs, and, in particular, how the relevant processes depend on Fermi energy have been put forward. We present a unified and intuitive physical picture of the ultrafast carrier dynamics and the photoconductivity, combining optical pump-terahertz probe measurements on a gate-t

SUBMITTER: Tomadin A 

PROVIDER: S-EPMC5947979 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature