Vibrational properties of single-wall nanotubes and monolayers of hexagonal BN

Details Vibrational properties of single-wall nanotubes and monolayers of hexagonal BN Vibrational properties of single-wall nanotubes and monolayers of hexagonal BN

2002-11-08

arxiv.org/abs/cond-mat/0211173v1

Physical Review B 66, 235415 (2002)

Physics

Condensed Matter

Materials Science

14 pages with 10 postscript figures, to appear in PRB, January 15th 2003

Scientific paper

10.1103/PhysRevB.66.235415

We report a detailed study of the vibrational properties of BN single-walled nanotubes and of the BN monolayer. Our results have been obtained from a well-established Tight-Binding model complemented with an electrostatic model to account for the long-range interactions arising from the polar nature of the material, and which are not included in the Tight-Binding model. Our study provides a wealth of data for the BN monolayer and nanotubes, such as phonon band structure, vibrational density of states, elastic constants, etc. For the nanotubes we obtain the behavior of the optically active modes as a function of the structural parameters, and we compare their frequencies with those derived from a zone-folding treatment applied to the phonon frequencies of the BN monolayer, finding general good agreement between the two.

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