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Title:Optical properties of confined and unconfined excitons in semiconductor quantum heterostructures
Author(s):Wen, Guozhong
Doctoral Committee Chair(s):Chang, Yia-Chung
Department / Program:Physics
Discipline:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Physics, Condensed Matter
Abstract:In this thesis the electronic and optical properties of confined and unconfined excitons in semiconductor quantum heterostructures are investigated. We use multiband effective mass theory to solve the subband structure in which valence band mixing is properly taking into account. With the aid of supercomputer and recently developed k-space sampling technique we can deal with both discrete exciton states and exciton continuum states properly and hence the photoabsorption coefficient. These techniques are applied to calculate the electroabsorption, resonant Raman scattering in GaAs quantum wells, and absorption of above barrier excitons in both type I and type II heterostructures. We find that the valence band mixing is important in explaining the fine structures in the spectrum for the electroabsorption and PLE for above barrier excitons. In the RRS profile, the exciton continuum states are necessary in order to explain the experimental data.
Issue Date:1994
Type:Text
Language:English
URI:http://hdl.handle.net/2142/22061
Rights Information:Copyright 1994 Wen, Guozhong
Date Available in IDEALS:2011-05-07
Identifier in Online Catalog:AAI9512592
OCLC Identifier:(UMI)AAI9512592


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