Anisotropy of excitation and relaxation of photogenerated charge carriers in graphene
Anisotropy of excitation and relaxation of photogenerated charge carriers in graphene
Mittendorff, M.; Winzer, T.; Malic, E.; Knorr, A.; Berger, C.; de Heer, W. A.; Schneider, H.; Helm, M.; Winnerl, S.
We present pump-probe experiments on graphene, which reveal a pronounced dependence of the pump-induced transmission on the angle between pump and probe polarization. It reflects a strong anisotropy of the pump-induced occupation of photogenerated carriers in momentum space. Within 150 fs after excitation an isotropic carrier distribution is established. The experiments are well described by microscopic modelling, which identify carrier-phonon scattering to be the main relaxation mechanism giving rise to an isotropic carrier distribution.
Keywords: graphene; carrier-dynamics; anisotropy; collinear scattering
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Nano Letters 14(2014)3, 1504-1507
Online First (2014) DOI: 10.1021/nl404730y
Cited 81 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-20058
Publ.-Id: 20058