Formation of excitons from free electron-hole pairs due to acoustic phonon interactions in quantam wells

In-Keun Oh, Jai Singh

Research output: Contribution to journalComment/debate

Abstract

A study of the process of exciton formation due to acoustic phonon interaction in quantum wells (QWs) is presented. Considering that excitons are formed from photoexcited free electron-hole pairs, we have derived the rate of such formation as a function of density and temperature of charge carriers and wavevector K∥ of the center-of-mass motion of exciton, and finally applied our theory to GaAs/AlGaAs QWs. We have found that the formation of an exciton due to acoustic phonon emission is more efficient at relatively large values of K∥ (hot excitons) whereas that due to longitudinal optical (LO) phonon emission is more efficient at relatively small values of K∥.
Original languageEnglish
Pages (from-to)221-229
Number of pages9
JournalSuperlattices and Microstructures
Volume30
Issue number5
DOIs
Publication statusPublished - 2001

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