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.
@article{arxiv.cond-mat/0512667,
title = {Study of charge dynamics in transparent single-walled carbon nanotube films},
author = {F. Borondics and K. Kamaras and M. Nikolou and D. B. Tanner and Z. H. Chen and A. G. Rinzler},
journal= {arXiv preprint arXiv:cond-mat/0512667},
year = {2013}
}
Comments
6 pages, 4 figures, submitted to Phys. Rev. B v3: Fig. 2 replaced, changes in caption of Table II, minor changes in text