Phys. Rev. Lett. 96, 027401 (2006) [4 pages]Ultrafast Dynamics of Delocalized and Localized Electrons in Carbon NanotubesReceived 13 August 2005; published 18 January 2006 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.027401
DOI:
10.1103/PhysRevLett.96.027401
PACS:
78.67.Ch, 71.35.−y, 72.15.−v, 78.47.+p
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