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Through ultrafast pump-probe spectroscopy with intense pump pulses and a widecontinuum probe, we show that interband exciton peaks in single-walled carbonnanotubes (SWNTs) are extremely stable under high laser excitations. Estimatesof the initial densities of excitons from the excitation conditions, combinedwith recent theoretical calculations of exciton Bohr radii for SWNTs, suggestthat their positions do not change at all even near the Mott density. Inaddition, we found that the presence of lowest-subband excitons broadens allabsorption peaks, including those in the second-subband range, which provides aconsistent explanation for the complex spectral dependence of pump-probesignals reported for SWNTs.Comment: 4 pages, 4 figure

Stability of High-Density One-Dimensional Excitons in Carbon Nanotubes under High Laser Excitation