Ultrafast pseudospin dynamics in graphene

Interband optical transitions in graphene are subject to pseudospin selection rules. Impulsive excitation with linearly polarized light generates an anisotropic photocarrier occupation in momentum space that evolves at time scales shorter than 100 fs. Here, we investigate the evolution of nonequilibrium charges towards an isotropic distribution by means of fluence-dependent ultrafast spectroscopy and develop an analytical model able to quantify the isotropization process. In contrast to conventional semiconductors, the isotropization is governed by optical phonon emission, rather than electron-electron scattering, which nevertheless contributes in shaping the anisotropic photocarrier occupation within the first few femtoseconds.

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TRUSHIN, Maxim, Alexander GRUPP, Giancarlo SOAVI, Arne BUDWEG, Domenico DE FAZIO, Ugo SASSI, Antonio LOMBARDO, Andrea C. FERRARI, Wolfgang BELZIG, Alfred LEITENSTORFER, Daniele BRIDA, 2015. Ultrafast pseudospin dynamics in graphene. In: Physical Review B. 2015, 92(16), 165429. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.92.165429

BibTex

@article{Trushin2015Ultra-32088,
  year={2015},
  doi={10.1103/PhysRevB.92.165429},
  title={Ultrafast pseudospin dynamics in graphene},
  number={16},
  volume={92},
  issn={1098-0121},
  journal={Physical Review B},
  author={Trushin, Maxim and Grupp, Alexander and Soavi, Giancarlo and Budweg, Arne and De Fazio, Domenico and Sassi, Ugo and Lombardo, Antonio and Ferrari, Andrea C. and Belzig, Wolfgang and Leitenstorfer, Alfred and Brida, Daniele},
  note={Article Number: 165429}
}

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