OPTICAL-PHONON-ASSISTED AND ACOUSTICAL-PHONON-ASSISTED HOPPING OF LOCALIZED EXCITONS IN CDTE/ZNTE QUANTUM-WELLS

TitleOPTICAL-PHONON-ASSISTED AND ACOUSTICAL-PHONON-ASSISTED HOPPING OF LOCALIZED EXCITONS IN CDTE/ZNTE QUANTUM-WELLS
Publication TypeJournal Article
Year of Publication1992
AuthorsKALT, H., J. COLLET, S. D. BARANOVSKII, R. Saleh, P. THOMAS, L. S. DANG, and J. CIBERT
JournalPhysical Review B
Volume45
Pagination4253-4257
Date PublishedFEB 15
Type of ArticleArticle
ISSN0163-1829
Abstract

Interaction with both acoustical as well as optical phonons contributes to the relaxation of excitons in tail states of coherently strained CdTe/ZnTe quantum wells. The contribution of acoustical phonons is most important in the thinnest well of 1.8 monolayers. Hopping down, which involves the emission of acoustic phonons, leads to a redshift of the luminescence band of about 10 meV within the first 200 ps after excitation. A comparison of the experimental data with results of a quantitative theory allows us to evaluate the concentration of localized states involved in the relaxation process.

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