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Elastic Exciton-Exciton Scattering in Photoexcited Carbon Nanotubes

D. T. Nguyen, C. Voisin, Ph. Roussignol, C. Roquelet, J. S. Lauret, and G. Cassabois Phys. Rev. Lett. 107, 127401 (2011)

We report on original nonlinear spectral hole-burning experiments in single wall carbon nanotubes that bring evidence of pure dephasing induced by exciton-exciton scattering. We show that the collision-induced broadening in carbon nanotubes is controlled by exciton-exciton scattering as for Wannier excitons in inorganic semiconductors, while the population relaxation is driven by exciton-exciton annihilation as for Frenkel excitons in organic materials. We demonstrate that this singular behavior originates from the intrinsic one-dimensionality of excitons in carbon nanotubes, which display unique hybrid features of organic and inorganic systems.

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