• DOI:10.1021/nl404730y
• Corpus ID: 207741052

Anisotropy of excitation and relaxation of photogenerated charge carriers in graphene.

@article{Mittendorff2013AnisotropyOE,
  title={Anisotropy of excitation and relaxation of photogenerated charge carriers in graphene.},
  author={Martin Mittendorff and Torben Winzer and Ermin Malic and Andreas Knorr and Claire Berger and Walt A. de Heer and Harald Schneider and Manfred Helm and Stephan Winnerl},
  journal={Nano letters},
  year={2013},
  volume={14 3},
  pages={
          1504-7
        }
}

• M. Mittendorff, T. Winzer, +6 authors S. Winnerl
• Published 20 December 2013
• Physics
• Nano letters

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.