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research article
Exciton localization and drift in tailored-potential quantum nanowires
Exciton recombination dynamics in tailored-potential, site-controlled AlGaAs quantum wires (QWRs) are studied. Time-resolved photoluminescence spectra evidence exciton localization in weakly disordered "uniform" QWRs, whereas deterministic bandgap grading is shown to suppress localization and promote exciton drift along the potential gradient. Measured exciton transit times between two quantum dot probes placed at opposite ends of the potential gradient yield the effective 1D exciton mobility as >1300 cm(2)/(eVs). (C) 2014 AIP Publishing LLC.
Type
research article
Web of Science ID
WOS:000339114100021
Authors
Publication date
2014
Publisher
Published in
Volume
104
Issue
26
Article Number
261905
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
August 29, 2014
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