Electronic response of aligned multishell carbon nanotubes

Details Electronic response of aligned multishell carbon nanotubes Electronic response of aligned multishell carbon nanotubes

2000-11-10

arxiv.org/abs/cond-mat/0011184v1

Phys. Rev. B 63, 73404 (2001)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.63.073404

We report calculations of the effective electronic response of aligned multishell carbon nanotubes. A local graphite-like dielectric tensor is assigned to every point of the multishell tubules, and the effective transverse dielectric function of the composite is computed by solving Maxwell's equations. Calculations of both real and imaginary parts of the effective dielectric function are presented, for various values of the filling fraction and the ratio of the internal and external radii of hollow tubules. Our full calculations indicate that the experimentally measured macroscopic dielectric function of carbon nanotube materials is the result of a strong electromagnetic coupling between the tubes, which cannot be accounted for with the use of simplified effective medium theories. The presence of surface plasmons is investigated, and both optical absorption cross sections and energy-loss spectra of aligned tubules are calculated.

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