Exciton effects in optical absorption spectra of boron-nitride (BN) nanotubes

Details Exciton effects in optical absorption spectra of boron-nitride (BN) nanotubes Exciton effects in optical absorption spectra of boron-nitride (BN) nanotubes

2008-07-08

arxiv.org/abs/0807.1147v2

Japanese Journal of Applied Physics, Vol. 48, 065007 (2009)

Physics

Condensed Matter

Materials Science

5 pages, 3 figures

Scientific paper

10.1143/JJAP.48.065007

Exciton effects are studied in single-wall boron-nitride nanotubes. The Coulomb interaction dependence of the band gap, the optical gap, and the binding energy of excitons are discussed. The optical gap of the (5,0) nanotube is about 6eV at the onsite interaction U=2t with the hopping integral t=1.1eV. The binding energy of the exciton is 0.50eV for these parameters. This energy agrees well with that of other theoretical investigations. We find that the energy gap and the binding energy are almost independent of the geometries of nanotubes. This novel property is in contrast with that of the carbon nanotubes which show metallic and semiconducting properties depending on the chiralities.

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