Nonequilibrium phonon effect on time-dependent relaxation of hot electrons in semiconductor heterojunctions

W. Cai, M Cristina Marchetti, M. Lax

Research output: Contribution to journalArticle

37 Scopus citations


We have studied the effect of a nonequilibrium population of optical phonons on the energy relaxation of two-dimensional (2D) hot electrons in a semiconductor quantum well. A time-dependent analysis of the coupled electron LO-phonon system is presented. The 2D electrons are described by a temperature Te(t). The dynamics of the nonequilibrium lattice excitations is governed by a kinetic equation for phonon wave packets that was derived recently by us. If the lifetime of the LO phonons is larger than 5 psec, phonon reabsorption can slow down considerably the carrier cooling. The time evolution of the carrier temperature is calculated. The comparison with recent experiments is discussed.

Original languageEnglish (US)
Pages (from-to)1369-1372
Number of pages4
JournalPhysical Review B
Issue number3
StatePublished - 1987
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics

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