Nuytten, T;
Hayne, M;
Bansal, B;
LIU, H;
Hopkinson, M;
Moshchalkov, V;
(2011)
Charge separation and temperature-induced carrier migration in Ga1−xInxNyAs1−y multiple quantum wells.
Physical Review B
, 84
, Article 045302. 10.1103/PhysRevB.84.045302.
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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.
| Type: | Article |
|---|---|
| Title: | Charge separation and temperature-induced carrier migration in Ga1−xInxNyAs1−y multiple quantum wells |
| Location: | USA |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevB.84.045302 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevB.84.045302 |
| Language: | English |
| Additional information: | © 2011 American Physical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1315839 |
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