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 language | English |
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Article number | 161203 |
Journal | Physical Review B |
Volume | 93 |
Issue number | 16 |
DOIs | |
Publication status | Published - 2016 Apr 6 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics