Comparative study of the optical properties of single-walled carbon nanotubes within orthogonal and nonorthogonal tight-binding models

Valentin N. Popov, Luc Henrard

    Résultats de recherche: Contribution à un journal/une revueArticle

    Résumé

    The dielectric response function of single-walled carbon nanotubes is calculated within tight-binding models with different levels of complexity. First, the effects of the orbital basis set of the model, the orbitals overlap, and the structural optimization on the electronic band structure and the dielectric function of three small-radius nanotubes are investigated in detail. Second, the optical transition energies for a large number of nanotubes are derived from the peak positions of the imaginary part of the dielectric function for parallel and perpendicular light polarization. These results can be useful for the assignment of absorption spectra of nanotube samples and for the determination of the conditions for resonant Raman scattering from nanotubes. The obtained results are compared to recent spectrofluorimetric data on isolated single-walled carbon nanotubes.

    langue originaleAnglais
    Nombre de pages12
    journalPhysical Review B - Condensed Matter and Materials Physics
    Volume70
    Numéro de publication11
    Les DOIs
    Etat de la publicationPublié - 1 sept. 2004

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