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Title: Time-resolved two-photon excitation of dark states in quantum dots

We have performed time-resolved measurements of the time scale for conversion of excitons in dark states to bright (light-emitting) states in GaAs quantum dots. The dark states are pumped using two-photon absorption, while the bright state emission is observed in single-photon emission. This conversion time is connected to the spin flip time for carriers in the quantum dots. The time scale is found to be of the order of several hundred picoseconds.
Authors:
;  [1] ; ;  [2]
  1. Department of Physics and Astronomy, University of Pittsburgh, 3941 O'Hara St., Pittsburgh, Pennsylvania 15260 (United States)
  2. Institute for Integrative Nanosciences, IFW Dresden Helmholtzstr. 20, 01069 Dresden (Germany)
Publication Date:
OSTI Identifier:
22261549
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EXCITATION; EXCITONS; GALLIUM ARSENIDES; PHOTON EMISSION; PHOTONS; QUANTUM DOTS; SPIN FLIP; TIME RESOLUTION