Stability of 1-D Excitons in Carbon Nanotubes under High Laser Excitations

Details Stability of 1-D Excitons in Carbon Nanotubes under High Laser Excitations Stability of 1-D Excitons in Carbon Nanotubes under High Laser Excitations

2004-08-30

arxiv.org/abs/cond-mat/0408667v1

Phys. Rev. Lett. 94, 097401 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.94.097401

Through ultrafast pump-probe spectroscopy with intense pump pulses and a wide continuum probe, we show that interband exciton peaks in single-walled carbon nanotubes (SWNTs) are extremely stable under high laser excitations. Estimates of the initial densities of excitons from the excitation conditions, combined with recent theoretical calculations of exciton Bohr radii for SWNTs, suggest that their positions do not change at all even near the Mott density. In addition, we found that the presence of lowest-subband excitons broadens all absorption peaks, including those in the second-subband range, which provides a consistent explanation for the complex spectral dependence of pump-probe signals reported for SWNTs.

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