Charge separation and temperature-induced carrier migration in Ga1−x Inx N y As1− y multiple quantum wells

Nuytten, Thomas and Hayne, Manus and Bansal, Bhavtosh and Liu, H. Y. and Hopkinson, Mark and Moshchalkov, Victor V. (2011) Charge separation and temperature-induced carrier migration in Ga1−x Inx N y As1− y multiple quantum wells. Physical review B, 84. ISSN 1550-235X

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
ID Code:
30907
Deposited By:
Deposited On:
14 Dec 2009 08:53
Refereed?:
Yes
Published?:
Published
Last Modified:
09 Aug 2020 00:52