Energy relaxation mechanism of hot-electron ensembles in GaAs: Theoretical and experimental study of its temperature dependence

Jelena Sjakste, Nathalie Vast, Giuliana Barbarino, Matteo Calandra, Francesco Mauri, Junichi Kanasaki, Hiroshi Tanimura, Katsumi Tanimura

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We have recently demonstrated that the fast momentum relaxation due to electron-phonon scattering of hot electrons excited into the conduction band of GaAs leads to the formation of hot-electron ensembles spread over the Brillouin zone. In the present work, we study the energy relaxation of hot-electron ensembles in GaAs, by means of ab initio calculations and time-, energy-, and momentum-resolved spectroscopy. We theoretically show that when the temperature decreases, the energy relaxation time ascribed to electron-phonon interaction becomes faster than at ambient temperature and prove that this is indeed the case in the experimental results.

Original languageEnglish
Article number064302
JournalPhysical Review B
Volume97
Issue number6
DOIs
Publication statusPublished - 2018 Feb 6

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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