期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.017401
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada
- Canadian Foundation for Innovation
- Ministry of Research and Innovation (Ontario)
Single air-suspended carbon nanotubes (length 2-5 mu m) exhibit high optical quantum efficiency (7-20%) for low intensity resonant pumping. Under ultrafast excitation (150 fs), emission dramatically saturates at very low exciton numbers (2-6), which is attributed to highly efficient exciton-exciton annihilation over micron-length scales. Similar saturation behavior for 4 ps pulse excitation shows nonlinear absorption is not a contributing factor. The absorption cross sections (0.6-1.8 X 10(-17) cm(2)/atom) are determined by fitting to a stochastic model for exciton dynamics.
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