Anisotropy of excitation and relaxation of photogenerated charge carriers in graphene.
basic_science · Level V
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- Record sourced from PubMed, PMID 24559191.
- Also identified by DOI 10.1021/nl404730y.
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Abstract
We present a pump-probe experiment on graphene, which reveals 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 modeling, which identifies carrier-phonon scattering to be the main relaxation mechanism giving rise to an isotropic carrier distribution.