1 research outputs found
Fano Resonances in Mid-Infrared Spectra of Single-Walled Carbon Nanotubes
This work revisits the physics giving rise to the carbon nanotubes phonon
bands in the mid- infrared. Our measurements of doped and undoped samples of
single-walled carbon nanotubes in Fourier transform infrared spectroscopy show
that the phonon bands exhibit an asymmetric lineshape and that their effective
cross-section is enhanced upon doping. We relate these observations to
electron-phonon coupling or, more specifically, to a Fano resonance phenomenon.
We note that only the dopant-induced intraband continuum couples to the phonon
modes and that defects induced in the sidewall increase the resonance
probabilities.Comment: 5 pages, 4 figures and 1 Supplementary Information File (in pdf