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Ultrafast carrier dynamics of pristine bilayer graphene (BLG) and BLG intercalated with FeCl3 (FeCl3–G), were studied using time-resolved transient differential reflection (ΔR/R). Compared to BLG, the FeCl3–G data showed an opposite sign of ΔR/R, a slower rise time, and a single (instead of double) exponential relaxation. We attribute these differences in dynamics to the down-shifting in 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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Zou et al. (2010) studied this question.
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