Study of charge dynamics in transparent single-walled carbon nanotube films
F. Borondics (1), K. Kamaras (1), M. Nikolou (2), D. B. Tanner (2), Z., H. Chen (2), A. G. Rinzler (2) ((1) Research Institute for Solid State, Physics, Optics, Budapest, Hungary, (2) Department of Physics, University, of Florida, Gainesville, FL, U.S.A.)
TL;DR
This study investigates the charge dynamics of pristine and hole-doped single-walled carbon nanotube films across a broad frequency range and temperature spectrum, revealing a low-energy gap and doping-induced spectral shifts.
Contribution
It provides new insights into the optical properties and charge dynamics of carbon nanotube films through comprehensive spectral analysis and temperature-dependent measurements.
Findings
Evidence of a gap below 10 meV in the far infrared
Hole doping shifts spectral weight from interband transitions to far infrared
Temperature effects are confined to the far-infrared region
Abstract
We report the transmission over a wide frequency range (far infrared - visible) of pristine and hole-doped, free-standing carbon nanotube films at temperatures between 50 K and 300 K. Optical constants are estimated by Kramers-Kronig analysis of transmittance. We see evidence in the far infrared for a gap below 10 meV. Hole doping causes a shift of spectral weight from the first interband transition into the far infrared. Temperature dependence in both the doped and undoped samples is restricted to the far-infrared region.
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