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

In-Keun Oh; Jai Singh

doi:10.1006/spmi.2001.1001

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

In-Keun Oh, Jai Singh

CDU College of Engineering, IT and Environment

Research output: Contribution to journal › Comment/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 language	English
Pages (from-to)	221-229
Number of pages	9
Journal	Superlattices and Microstructures
Volume	30
Issue number	5
DOIs	https://doi.org/10.1006/spmi.2001.1001
Publication status	Published - 2001

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

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∥.",

author = "In-Keun Oh and Jai Singh",

year = "2001",

doi = "10.1006/spmi.2001.1001",

language = "English",

volume = "30",

pages = "221--229",

journal = "Superlattices and Microstructures",

issn = "0749-6036",

publisher = "Academic Press Inc.",

number = "5",

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TY - JOUR

T1 - Formation of excitons from free electron-hole pairs due to acoustic phonon interactions in quantam wells

AU - Oh, In-Keun

AU - Singh, Jai

PY - 2001

Y1 - 2001

N2 - 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∥.

AB - 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∥.

U2 - 10.1006/spmi.2001.1001

DO - 10.1006/spmi.2001.1001

M3 - Comment/debate

VL - 30

SP - 221

EP - 229

JO - Superlattices and Microstructures

JF - Superlattices and Microstructures

SN - 0749-6036

IS - 5

ER -

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

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