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Title: Charged two-exciton emission from a single semiconductor nanocrystal

Here, we study the photoluminescence (PL) time trajectories of single CdSe/ZnS nanocrystals (NCs) as a function of the laser excitation power. At the low laser power, the PL intensity of a single NC switches between the “on” and “off” levels arising from the neutral and positively charged single excitons, respectively. With the increasing laser power, an intermediate “grey” level is formed due to the optical emission from a charged multiexciton state composed of two excitons and an extra electron. Both the inter-photon correlation and the PL decay measurements demonstrate that lifetime-indistinguishable photon pairs are emitted from this negatively charged two-exciton state.
Authors:
; ; ;  [1] ;  [1] ;  [2]
  1. National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093 (China)
  2. (United States)
Publication Date:
OSTI Identifier:
22398831
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CADMIUM SELENIDES; CORRELATIONS; ELECTRONS; EXCITATION; EXCITONS; LASER RADIATION; LIFETIME; NANOSTRUCTURES; PHOTOLUMINESCENCE; PHOTONS; SEMICONDUCTOR MATERIALS; ZINC SULFIDES