Saturation of intersubband transitions in p -doped GaAsAlGaAs quantum wells

Robert Steed, Mary Matthews, Jonathan Plumridge, Mark Frogley, Chris Phillips, Zoran Ikonic, Paul Harrison, Oana Malis, Loren N. Pfeiffer, Kenneth W. West

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Optical saturation experiments have been performed on hh1-hh2 intersubband transitions in two samples of p -doped GaAsAlGaAs quantum wells. The transitions had energies of 183 and 160 meV and the measured population relaxation times were 2±1.5 and 0.3±0.1 ps, respectively. Modeling of the quantum wells with a 6×6 kp method shows that intersubband scattering by LO phonons can account for these relaxation times. The valence bandstructure is typically more complicated than the conduction bandstructure in a quantum well but these measurements show that LO phonons are the dominant intersubband scattering mechanism in both cases.

Original languageEnglish
Article number183104
JournalApplied Physics Letters
Volume92
Issue number18
DOIs
Publication statusPublished - 5 May 2008
Externally publishedYes

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