Intersubband relaxation of hot excitons in GaAs quantum wells

R. A. Hopfel, R. Rodrigues, Y. Limura, T. Yasui, Y. Segawa, Y. Aoyagi, S. M. Goodnick

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have experimentally studied the time evolution of the exciton population in a higher subband of GaAs quantum wells, below the free-carrier continuum. The lifetime of the exciton formed by an electron of the lowest subband and a heavy hole of the second subband in GaAs quantum wells is determined by time-resolved luminescence as 130+or-20 ps. This result is consistent with theoretical estimations of intersubband scattering by acoustic phonon emission. We discuss subband transitions of excitons in quantum wells as a new appealing concept for optically pumped coherent sources in the meV range.

Original languageEnglish (US)
Article number090
Pages (from-to)733-735
Number of pages3
JournalSemiconductor Science and Technology
Issue number5 S
StatePublished - 1994
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


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