Charged two-exciton emission from a single semiconductor nanocrystal

Journal Article · Mon Mar 30 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4916827· OSTI ID:22398831

Hu, Fengrui; Zhang, Qiang; Zhang, Chunfeng; Wang, Xiaoyong ^[1]; Xiao, Min ^[1]

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1. National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093 (China)

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.

• OSTI ID: 22398831
• Journal Information: Applied Physics Letters, Vol. 106, Issue 13; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CADMIUM SELENIDES
CORRELATIONS
ELECTRONS
EXCITATION
EXCITONS
LASER RADIATION
LIFETIME
NANOSTRUCTURES
PHOTOLUMINESCENCE
PHOTONS
SEMICONDUCTOR MATERIALS
ZINC SULFIDES