Exciton cooling in short period GaAs/AlGaAs superlattices

An experimental and theoretical study of the cooling of excitons in short period GaAs/Al sub(x)Ga sub(1-x)As superlattices (SLs) is presented. The time resolved luminescence results show that the exciton cooling rate is higher in a superlattice than in 3D GaAs and depends on the periodicity of the S...

Full description

Saved in:
Bibliographic Details
Published in:Superlattices and microstructures 1992, Vol.12 (1), p.7-15
Main Authors: MARIE, X, AMAND, T, DAREYS, B, RAZDOBREEV, I, SHEKUN, Y, BARRAU, J, BRABANT, J. C
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Physics
Surface and interface electron states
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An experimental and theoretical study of the cooling of excitons in short period GaAs/Al sub(x)Ga sub(1-x)As superlattices (SLs) is presented. The time resolved luminescence results show that the exciton cooling rate is higher in a superlattice than in 3D GaAs and depends on the periodicity of the SL. The experimental data can quantitatively be explained by a model which relies on a generalization of a 3D exciton cooling model, the SL being treated as a 3D anisotropic material. This model which takes into account the deformation potential and piezoelectric exciton-acoustic phonon interaction shows that the exciton energy loss rate increases when the SL miniband dispersion decreases.
ISSN:0749-6036
1096-3677
DOI:10.1016/0749-6036(92)90213-O