Plasmonic nature of the terahertz conductivity peak in single-wall carbon nanotubes.
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 direct current (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.
Department of Electrical and Computer Engineering, ‡Department of Earth Science, §Department of Chemistry, and ∥Department of Physics and Astronomy, Rice University , Houston, Texas 77005, United States.
Qi
Q
Zhang
Erik H
EH
Hároz
Zehua
Z
Jin
Lei
L
Ren
Xuan
X
Wang
Rolf S
RS
Arvidson
Andreas
A
Lüttge
Junichiro
J
Kono
D000042:Absorption; D004553:Electric Conductivity; D037742:Nanotubes, Carbon / Q000737:chemistry*; D012666:Semiconductors; D020349:Surface Plasmon Resonance
D037742:Nanotubes, Carbon