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Symmetry properties of impurities in metallic single-wall carbon nanotubes.

McCann, Edward and Falko, Vladimir I. (2004) Symmetry properties of impurities in metallic single-wall carbon nanotubes. International Journal of Modern Physics B (IJMPB), 18 (23-24). pp. 3195-3212. ISSN 0217-9792

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Abstract

We use the effective mass model to describe spinless electrons near the Fermi level in metallic, single-wall carbon nanotubes. Taking into account two nonequivalent valleys (K-points) produces a four component Dirac equation for massless fermions, with the role of spin assumed by pseudospin due to the relative amplitude of the wavefunction on the two nonequivalent sublattice atoms. We show that the position of a short-ranged impurity within the hexagonal graphite unit cell produces a particular 4×4 matrix structure of the corresponding effective Hamiltonian. The symmetry of this Hamiltonian with respect to pseudospin flip is related to degeneracy breaking and, for an armchair tube, symmetry with respect to mirror reflection in the nanotube axis is related to pseudospin mixing. In a nanotube of finite length, we predict a sinusoidal oscillation of energy level shift as a function of energy with a period determined by the position of the impurity along the tube axis.

Item Type: Article
Journal or Publication Title: International Journal of Modern Physics B (IJMPB)
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23932
Deposited By: ep_ss_importer
Deposited On: 24 Feb 2009 10:12
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:18
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23932

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