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Título : Calculation of direct and indirect excitons in GaAs/Ga1−xAlxAs coupled double quantum wells : the effects of in-plane magnetic fields and growth-direction electric fields
Autor : de Dios Leiva, Melquiades
Duque Echeverri, Carlos Alberto
Oliveira, Luiz Eduardo
metadata.dc.subject.*: Excitones directos e indirectos
Pozos cuánticos
Campos magnéticos
Campos eléctricos
Magnetic fields
Fecha de publicación : 2007
Editorial : The American Physical Society
Citación : de Dios Leiva, M., Duque Echeverri, C. A., & Oliveira, L. E. (2007). Calculation of direct and indirect excitons in GaAs/Ga1−xAlxAs coupled double quantum wells: The effects of in-plane magnetic fields and growth-direction electric fields. Physical Review, B. 76(7), 75303-75309
Resumen : ABSTRACT: The variational procedure, in the effective-mass and parabolic-band approximations, is used in order to investigate the effects of crossed electric and magnetic fields on the exciton states in GaAs/Ga1−xAlxAs coupled double quantum wells. Calculations are performed for double quantum wells under applied magnetic fields parallel to the layers and electric fields in the growth direction. The exciton envelope wave function is obtained through a variational procedure using a hydrogenic 1s-like wave function and an expansion in a complete set of trigonometric functions for the electron and hole wave functions. We take into account intersubband mixing brought about by the Coulomb interaction of electron-hole pairs in double quantum wells and present a detailed analysis of the properties of direct and indirect exciton states in these systems. The present study clearly reveals anticrossing effects on the dispersion with applied voltage or growth-direction electric field of the photoluminescence peaks associated with direct and indirect excitons. Calculated results are found in good agreement with available experimental measurements on the photoluminescence peak position associated with direct and indirect excitons in GaAs-Ga1−xAlxAs double quantum wells under growthdirection applied electric fields or under applied in-plane magnetic fields.
ISSN : 163-1829
metadata.dc.identifier.doi: 10.1103/PhysRevB.76.075303
Aparece en las colecciones: CIEN (Centro de Investigaciones en Ciencias Exactas y Naturales)

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