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Type: Artigo de periódico
Title: Magnetic-field effects on excitons trapped in quantum dots/interface defects in narrow quantum wells
Author: Barticevic, Z
Pacheco, M
Duque, CA
Oliveira, LE
Abstract: A theoretical study, within the effective-mass approximation, of the effects of applied magnetic fields on excitons trapped in quantum dots/interface defects is presented. Actual traps are formed by fluctuations either in composition or structure size in narrow GaAs/Ga1-xAlxAs quantum wells. Exciton trapping is taken into account through a model quantum dot formed by monolayer fluctuations in the z direction, and lateral confinement, via a parabolic potential, in the exciton-in plane coordinate. Magnetic fields are applied in the growth direction of the semiconductor heterostructure, and the various magnetoexciton states are obtained in the effective-mass approximation by an expansion of the exciton-envelope wave functions in terms of products of hole and electron quantum-well states with appropriate Gaussian functions for the various excitonic states. Theoretical results are found in overall agreement with available experimental measurements.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.68.073312
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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