Electronic structure of multiwall boron nitride nanotubes

We report on electron energy-loss spectroscopy studies of the electronic properties of multiwall boron nitride nanotubes, in terms of the $\mathrm{B}1s$ and $\mathrm{N}1s$ excitation edges and of the q-dependent energy-loss function. The q-dependent dielectric function shows a strong dispersion in momentum of the \ensuremath{\pi} and $\ensuremath{\sigma}+\ensuremath{\pi}$ plasmons indicating that they are spatially delocalized along the tube axis as expected according to their characteristic two-dimensional graphiticlike structure, and nondispersing excitations at 11 and 12 eV. The dielectric function \ensuremath{\varepsilon} of the boron nitride nanotubes reveals an intense $\ensuremath{\pi}\ensuremath{-}{\ensuremath{\pi}}^{*}$ interband transition at 5.4 eV, which is shifted to lower energies by 0.6 eV when compared to hexagonal BN in good agreement with recent theoretical band-structure calculations of boron nitride nanotubes.

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