Nonequilibrium phonon dynamics and electron distribution functions in InP and InAs

E. D. Grann, Kong-Thon Tsen, D. K. Ferry

Research output: Contribution to journalArticle

49 Scopus citations


We have used subpicosecond laser pulses to study the generation of nonequilibrium LO phonons in both InP and InAs. These two semiconductors provide a contrast in that the decaying of the Raman signal probes different relaxation mechanisms. In InP, for example, we find that the decay of the Raman signal is dominated by the lifetime of the LO phonons. On the contrary, in InAs, our studies show that the decay of the Raman signal is governed by the time required for electrons to return to the Γ valley from the L valleys of the conduction bands. In addition, nonequilibrium electron distributions were also studied in InP and InAs. We have found that the single-particle-scattering spectrum in InAs can only be observed with the use of a much longer laser pulse width than subpicosecond as a result of electron intervalley scattering and very small electron effective mass.

Original languageEnglish (US)
Pages (from-to)9847-9851
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number15
StatePublished - Jan 1 1996


ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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