Fano Resonances in Mid-Infrared Spectra of Single-Walled Carbon Nanotubes

Details Fano Resonances in Mid-Infrared Spectra of Single-Walled Carbon Nanotubes Fano Resonances in Mid-Infrared Spectra of Single-Walled Carbon Nanotubes

2012-03-14

arxiv.org/abs/1203.3224v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures and 1 Supplementary Information File (in pdf)

Scientific paper

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.

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