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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Charge separation and temperature-induced carrier migration in Ga1−x Inx N y As1− y multiple quantum wells
AU - Nuytten, Thomas
AU - Hayne, Manus
AU - Bansal, Bhavtosh
AU - Liu, H. Y.
AU - Hopkinson, Mark
AU - Moshchalkov, Victor V.
PY - 2011/7/5
Y1 - 2011/7/5
N2 - 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.
AB - 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.
KW - Dilute nitrides
KW - multiple quantum wells
KW - magneto-photoluminescence
KW - excitons
U2 - 10.1103/PhysRevB.84.045302
DO - 10.1103/PhysRevB.84.045302
M3 - Journal article
VL - 84
JO - Physical review B
JF - Physical review B
SN - 1550-235X
M1 - 045302
ER -