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Type: Artigo de periódico
Title: Dressed-band approach and Coulomb corrections to the light-induced exciton Stark shift
Author: Brandi, HS
Latge, A
Oliveira, LE
Abstract: In the present work, we perform a comparison of theoretical approaches involving Coulomb-interaction corrections within the Hartree-Fock approximation and the renormalized dressed-band scheme in the large detuning limit. We focus on the well-studied optical Stark shift of the exciton peak in bulk and GaAs-(Ga,Al)As semiconductor quantum wells. It is argued that the Hartree-Fock scheme has severe limitations concerning its application to real experimental situations, even in the simplest laser field-perturbative regime. It is also shown, through a comparison between experiments and a three-band Kane-dressed GaAs-(Ga,Al)As quantum well calculation, that a proper treatment of band structure and confinement effects due to the quantum well is of fundamental importance in a theoretical understanding of Stark shift experimental measurements, and that the renormalized dressed-band approach is a very convenient tool to treat, in the large detuning limit, processes involving the laser-semiconductor interaction in low-dimensional heterostructures. (C) 2003 American Institute of Physics.
Country: EUA
Editor: Amer Inst Physics
Citation: Journal Of Applied Physics. Amer Inst Physics, v. 94, n. 9, n. 5742, n. 5747, 2003.
Rights: aberto
Identifier DOI: 10.1063/1.1614863
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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