Elastic exciton-exciton scattering in photoexcited carbon nanotubes

Abstract : 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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Physical Review Letters, American Physical Society, 2011, 107 (12), pp.127401. <10.1103/PhysRevLett.107.127401>
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D. T. Nguyen, C. Voisin, Ph. Roussignol, C. Roquelet, Jean-Sébastien Lauret, et al.. Elastic exciton-exciton scattering in photoexcited carbon nanotubes. Physical Review Letters, American Physical Society, 2011, 107 (12), pp.127401. <10.1103/PhysRevLett.107.127401>. <hal-00623859>

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