Raman and hot electron-neutral acceptor luminescence studies of electron-optical phonon interactions in GaAs/AlxGa1-xAs quantum wells

Kien-Wen Sun*, H. Y. Chang, C. M. Wang, T. S. Song, S. Y. Wang, C. P. Lee

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Using two optical techniques, we have studied the hot electron-optical phonon interactions in GaAs/AlxGa1-xAs multiple-quantum wells. Raman scattering measurements at 15 K are presented for the Al composition of x = 0.3, 0.5, 0.7 and 1.0. The GaAs-like and AlAs-like phonon frequencies of the first-order modes are also measured as a function of Al composition. The optical phonon energies emitted by the photoexcited electrons in quantum wells are determined by using hot electron-neutral acceptor luminescence techniques. It is shown that the relaxation of hot electrons in the quantum wells is dominated by the GaAs LO phonon emission for small x, but by AlAs-like LO phonons for larger Al composition.

Original languageEnglish
Pages (from-to)563-567
Number of pages5
JournalSolid State Communications
Volume115
Issue number10
DOIs
StatePublished - 31 Jul 2000

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