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Title: Charge separation and temperature-induced carrier migration in Ga1-xInxNyAs1-y multiple quantum wells
Authors: Nuytten, Thomas ×
Hayne, Manus
Bansal, Bhavtosh
Liu, H. Y
Hopkinson, M
Moshchalkov, Victor #
Issue Date: Jul-2011
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:84 issue:4 pages:1-8
Article number: 045302
Abstract: We have investigated the photoluminescence (PL) of two carefully selected dilute nitride Ga1-xInxNyAs1-y multiple quantum well structures in magnetic fields up to 50 T as a function of temperature and excitation power. The observation of a nonmonotonic dependence of the PL energy on temperature indicates that localized states dominate the luminescence at low temperature, while magneto-PL experiments give new insights into the nature of the localization. We find that the low-temperature spatial distribution of carriers in the quantum well is different for electrons and holes because they are captured by different disorder-induced complexes that are spatially separated. A study of the thermalization of the carriers toward free states leads to the determination of the free-exciton wave-function extent in these systems and enables an assessment of the localization potentials induced by inhomogeneity in the quantum well.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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