Phys. Rev. Lett. 102, 037401 (2009) [4 pages]Nonlinear Photoluminescence Excitation Spectroscopy of Carbon Nanotubes: Exploring the Upper Density Limit of One-Dimensional ExcitonsReceived 18 April 2008; published 21 January 2009 We have observed that photoemission from single-walled carbon nanotubes saturates in intensity as the excitation intensity increases. Each emission peak arising from specific-chirality tubes exhibited a saturation value independent of the excitation wavelength, suggesting an upper limit on the exciton density for each nanotube species. We developed a model based on diffusion-limited exciton-exciton annihilation, which allowed us to estimate exciton densities in the saturation regime. The estimated densities were found to be still substantially smaller than the expected Mott density. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.037401
DOI:
10.1103/PhysRevLett.102.037401
PACS:
78.67.Ch, 71.35.−y, 78.55.−m
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