Formation of hot-electron ensembles quasiequilibrated in momentum space by ultrafast momentum scattering of highly excited hot electrons photoinjected into the Γ valley of GaAs

Hiroshi Tanimura, Jun'Ichi Kanasaki, Katsumi Tanimura, Jelena Sjakste, Nathalie Vast, Matteo Calandra, Francesco Mauri

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We study ultrafast scattering dynamics of hot electrons photoinjected with high excess energies in the Γ valley of the conduction band of GaAs, using time- and angle-resolved photoemission spectroscopy and ab initio calculations. At ultrafast rates of the order of 10 fs, the packets in the Γ valley are transformed into hot-electron ensembles (HEEs) quasiequilibrated in momentum space but not in energy space. The energy relaxation of the HEEs takes place as a whole on a longer time scale with rates dependent only on the excess energy, irrespective of the momenta of hot electrons. Both momentum scattering and energy relaxation are ruled by the electron-phonon interaction.

Original languageEnglish
Article number161203
JournalPhysical Review B
Volume93
Issue number16
DOIs
Publication statusPublished - 2016 Apr 6

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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