Qi Zhang , Erik Haroz , Zehua Jin , Lei Ren , Xuan Wang , Rolf S. Arvidson , Andreas Luttge , and Junichiro Kono
http://pubs.acs.org/doi/abs/10.1021/nl403175g?journalCode=nalefd
Plasmon resonance is expected to occur in metallic and doped semiconducting carbon nanotubes in the terahertz frequency range, but its convincing identification has so far been elusive. The origin of the terahertz conductivity peak commonly observed for carbon nanotube ensembles remains controversial. Here we present results of optical, terahertz, and DC transport measurements on highly enriched metallic and semiconducting nanotube films. A broad and strong terahertz conductivity peak appears in both types of films, whose behaviors are consistent with the plasmon resonance explanation, firmly ruling out other alternative explanations such as absorption due to curvature-induced gaps.
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