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Excitonic transitions in GaAs-AlxGa1-xAs multiple quantum wells affected by interface roughness

Zhou, P. and Jiang, H. X. and Bannwart, R. and Solin, S. A. and Bai, G. (1989) Excitonic transitions in GaAs-AlxGa1-xAs multiple quantum wells affected by interface roughness. Physical Review B, 40 (17). pp. 11862-11867. ISSN 0163-1829. http://resolver.caltech.edu/CaltechAUTHORS:ZHOprb89

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Abstract

Time-resolved photoluminescence has been used to study the effects of interface roughness on excitonic transitions in GaAs-AlxGa1-xAs multiple quantum wells. In addition to the luminescence linewidth broadening and Stokes red shift, the interface roughness also strongly affects the dynamic process of optical transitions so that the excitonic transition peak shifts with delay time. However, the heavy-hole exciton transition has red shifts at short delay times and exhibits a turnover at longer delay times. A maximum shift of about 0.1 meV at a delay time of 4 ns was obtained. We have demonstrated that the peak shift is caused by interface roughness in the quantum wells. Furthermore, the decay of the excitonic transition is found to fit a two-exponential form. Based on a model involving interface roughness and two-exponential decay, we calculated the position of the excitonic transition peak as a function of delay time. Our calculations are consistent with experimental results.


Item Type:Article
Additional Information:©1989 The American Physical Society Received 31 July 1989 The research reported here was supported by the Michigan State University Center for Fundamental Materials Research. H.X.J. would like to acknowledge useful discussion with J.Y. Lin.
Record Number:CaltechAUTHORS:ZHOprb89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:ZHOprb89
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.40.11862
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6477
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:11 Dec 2006
Last Modified:26 Dec 2012 09:21

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