Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube Bundles

J. Kono; S. Maruyama; Y. Hashimoto; Y. Murakami

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Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube Bundles

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arxiv cond-mat/0701012 v1 pith:CKSXHRJB submitted 2006-12-31 cond-mat.mes-hall cond-mat.mtrl-sci

Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube Bundles

Y. Hashimoto , Y. Murakami , S. Maruyama , J. Kono This is my paper

classification cond-mat.mes-hall cond-mat.mtrl-sci

keywords nanotubebundlesdynamicsalignedanisotropiccarbonperpendicularrelaxation

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We have performed polarization-dependent ultrafast pump-probe spectroscopy of a film of aligned single-walled carbon nanotube bundles. By taking into account imperfect nanotube alignment as well as anisotropic absorption cross sections, we quantitatively determined distinctly different photo-bleaching dynamics for polarizations parallel and perpendicular to the tube axis. For perpendicular polarization, we observe a slow (1.0-1.5 ps) relaxation process, previously unobserved in randomly-oriented nanotube bundles. We attribute this slower dynamics to the excitation and relaxation of surface plasmons in the radial direction of the nanotube bundles.

Anisotropic Decay Dynamics of Photoexcited Aligned Carbon Nanotube Bundles

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