Ultrafast dynamics of delocalized and localized electrons in carbon nanotubes |
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Authors: | Perfetti L Kampfrath T Schapper F Hagen A Hertel T Aguirre C M Desjardins P Martel R Frischkorn C Wolf M |
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Affiliation: | Fachbereich Physik, Freie Universit?t Berlin, 14195 Berlin, Germany. |
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Abstract: | We report on the dynamics of the dielectric function of single-wall carbon nanotubes in the 10-30 THz frequency range after ultrafast laser excitation. The absence of a distinct free-carrier response is attributed to the photogeneration of strongly bound excitons in the tubes with large energy gaps. We find a feature of enhanced transmission caused by the blocking of optical transitions in small-gap tubes. The rapid decay of a featureless background with pronounced dichroism is associated with the increased absorption of spatially localized charge carriers before thermalization is completed. |
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