Ultrafast carrier dynamics in pristine and FeCl3-intercalated bilayer graphene

Details Ultrafast carrier dynamics in pristine and FeCl3-intercalated bilayer graphene Ultrafast carrier dynamics in pristine and FeCl3-intercalated bilayer graphene

2010-10-11

arxiv.org/abs/1010.2073v1

APPLIED PHYSICS LETTERS 97, 141910 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

14 pages, 4 figures

Scientific paper

10.1063/1.3497644

Ultrafast carrier dynamics of pristine bilayer graphene (BLG) and bilayer graphene intercalated with FeCl3 (FeCl3-G), were studied using time-resolved transient differential reflection (delta R/R). Compared to BLG, the FeCl3-G data showed an opposite sign of delta R/R, a slower rise time, and a single (instead of double) exponential relaxation. We attribute these differences in dynamics to the down-shifting of the Fermi level in FeCl3-G, as well as the formation of numerous horizontal bands arising from the d-orbitals of Fe. Our work shows that intercalation can dramatically change the electronic structure of graphene, and its associated carrier dynamics.

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