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

Abstract

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.

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

References in corpus (3)

• Optical Phonons in Carbon Nanotubes: Kohn Anomalies, Peierls Distortions and Dynamic Effects
• Phonon Linewidths and Electron Phonon Coupling in Nanotubes
• Structurally Dependent Fano Resonances in the Infrared Spectra of Phonons in Few-Layer Graphene

Cited by in corpus (6)

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• Size-dependent thermal stability and optical properties of ultra-small nanodiamonds synthesized under high pressure
• Temperature dependence of Fano resonance in nanodiamonds synthesized at high static pressures
• Diffusive and Unimolecular Nonradiative Decay of Excited States in Doped Carbon Nanotubes
• Phonon-Induced Transparency in Functionalized Single Layer Graphene