Charge separation and temperature-induced carrier migration in Ga_(1-x)In_xN_yAs_(1-y) multiplequantum wells

T. Nuytten; M. Hayne; Bhavtosh BansalH. Y. LiuM. HopkinsonV. V. Moshchalkov

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Charge separation and temperature-induced carrier migration in Ga_(1-x)In_xN_yAs_(1-y) multiplequantum wells

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We have investigated the photoluminescence (PL) of two carefully selected dilute nitride Ga_(1-x)In_xN_yAs_(1-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.

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《Physical review, B. Condensed matter and materials physics》 |2011年第4期|045302:1-045302:8|共8页
作者
T. Nuytten; M. Hayne; Bhavtosh BansalH. Y. LiuM. HopkinsonV. V. Moshchalkov;
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作者单位

Institute for Nanoscale Physics and Chemistry (INPAC), K. U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;

Department of Physics, Lancaster University, Lancaster LAI 4YB, United Kingdom;

Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, Nadia 741252, IndiaDepartment of Electronic and Electrical Engineering, University of Sheffield, Mappin Street, Sheffield SI 3JD, United Kingdom;

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正文语种英语
中图分类物理学;
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Charge separation; temperature-induced; quantum wells;

Charge separation and temperature-induced carrier migration in Ga_(1-x)In_xN_yAs_(1-y) multiplequantum wells

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