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. 
Fran\c{c}ois Lapointe, \'Etienne Gaufr\'es, Isabelle Tremblay,   Nathalie Y-Wa Tang, Patrick Desjardins, and Richard Martel
cond-mat.mtrl-sci cond-mat.mes-hall