Journal
CARBON
Volume 44, Issue 14, Pages 2883-2895Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2006.05.050
Keywords
carbon nanotubes; dielectric properties; modeling; point dipole interaction model; Gaussian regularization
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A Gaussian regularized dipolar model has been developed for carbon sp(2) structures. It is based on three parameters: the two components of the local polarizability tensor of the carbon atoms and a regularization parameter related to the size of the electronic clouds. The parameters of the model have been adjusted to reproduce the polarizability of isolated and FCC aggregates of C-60 and C-70 molecules, while avoiding any polarization catastrophes. The model has been applied to semiconducting single-wall nanotubes of finite and infinite length. Asymptotically, the axial and transverse polarizability per unit length vary linearly and quadratically with the tube radius, respectively, as already predicted by a tight-binding model and ab initio methods. As for multi-wall nanotubes, we show that the transverse polarizability is close to the transverse polarizability of the external layer taken alone, while the axial polarizability is close to the sum of the axial polarizabilities of the individual layers. (c) 2006 Elsevier Ltd. All rights reserved.
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