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Título : Binding energy and density of shallow impurity states in GaAs–(Ga, Al)As quantum wells : effects of an applied hydrostatic stress
Autor : López Ríos, Sonia Yaneth
Porras Montenegro, Nelson
Duque Echeverri, Carlos Alberto
metadata.dc.subject.*: Hydrostatic pressure
Electric field
Presión hidróstatica
Fecha de publicación : 2003
Editorial : Institute of Physics Publishing Ltd.
Citación : López Ríos, S. Y., Porras-Montenegro, N., & Duque, C. A. (2003). Binding energy and density of shallow impurity states in GaAs–(Ga, Al)As quantum wells: effects of an applied hydrostatic stress. Semiconductor Science and Technology, 18(7), 718-722.
Resumen : ABSTRACT: The effects of hydrostatic stress on the binding energy and the density of shallow-donor and shallow-acceptor impurity states in a GaAs–(Ga, Al)As quantum well are calculated using a variational procedure within the effective-mass approximation. Results are for different well widths and hydrostatic stresses, as a function of the impurity position along the growth direction of the structure. We have found that in the low-pressure regime the binding energy changes linearly for both donor and acceptor impurities, independently of the sizes of the well. However, for high pressures (greater than 13.5 kbar) this is valid for acceptors but not for donors due to the -X crossover. We have shown that there are two special structures in the density of impurity states, one associated with on-centre and the other with on-edge impurities. Also, we have observed that the density of impurity states depends strongly on the applied hydrostatic stress.
metadata.dc.identifier.eissn: 1361-6641
ISSN : 0268-1242
Aparece en las colecciones: Artículos de Revista en Ciencias Exactas y Naturales

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