We study ultrafast scattering dynamics of hot electrons photoinjected with high excess energies in the Gamma 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 Gamma 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.

Formation of hot-electron ensembles quasiequilibrated in momentum space by ultrafast momentum scattering of highly excited hot electrons photoinjected into the Gamma valley of GaAs / Tanimura, Hiroshi; Kanasaki, Jun'Ichi; Tanimura, Katsumi; Sjakste, Jelena; Vast, Nathalie; Calandra, Matteo; Mauri, Francesco. - In: PHYSICAL REVIEW. B. - ISSN 2469-9969. - 93:16(2016). [10.1103/PhysRevB.93.161203]

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

MAURI, FRANCESCO
2016

Abstract

We study ultrafast scattering dynamics of hot electrons photoinjected with high excess energies in the Gamma 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 Gamma 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.
2016
-
01 Pubblicazione su rivista::01a Articolo in rivista
Formation of hot-electron ensembles quasiequilibrated in momentum space by ultrafast momentum scattering of highly excited hot electrons photoinjected into the Gamma valley of GaAs / Tanimura, Hiroshi; Kanasaki, Jun'Ichi; Tanimura, Katsumi; Sjakste, Jelena; Vast, Nathalie; Calandra, Matteo; Mauri, Francesco. - In: PHYSICAL REVIEW. B. - ISSN 2469-9969. - 93:16(2016). [10.1103/PhysRevB.93.161203]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/866401
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