The Effect of Structural Distortions on the Electronic Structure of Carbon Nanotubes

Details The Effect of Structural Distortions on the Electronic Structure of Carbon Nanotubes The Effect of Structural Distortions on the Electronic Structure of Carbon Nanotubes

1998-08-24

arxiv.org/abs/cond-mat/9808269v2

Chemical Physics Letters, 297 (1998) 45

Physics

Condensed Matter

Materials Science

11 pages and 4 figures, (figure 4 corrected)

Scientific paper

10.1016/S0009-2614(98)01105-1

We calculated the effects of structural distortions on the electronic structure of carbon nanotubes. The key modification of the electronic structure brought about by bending a nanotube involves an increased mixing of $\sigma$ and $\pi$-states. This mixing leads to an enhanced density-of-states in the valence band near the Fermi energy region. While in a straight tube the states accessible for electrical conduction are essentially pure C($2p_{\pi}$)-states, they acquire significant C($2sp_{\sigma}$) character upon bending. Bending also leads to a charge polarization of the C-C bonds in the deformed region reminiscent of interface dipole formation. Scattering of conduction electrons at the distorted regions may lead to electron localization at low temperatures.

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