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Title: 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{sup 2}/(eVs).
Authors:
; ;  [1] ; ;  [2]
  1. Laboratory of Physics of Nanostructures, École Polytechnique Fédérale de Lausanne, 1015 Lausanne (Switzerland)
  2. P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow 119991 (Russian Federation)
Publication Date:
OSTI Identifier:
22303888
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 26; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ALUMINIUM COMPOUNDS; CARRIER MOBILITY; EV RANGE; EXCITONS; GALLIUM ARSENIDES; NANOWIRES; PHOTOLUMINESCENCE; QUANTUM DOTS; QUANTUM WIRES; RECOMBINATION; SPECTRA; TIME RESOLUTION