Disorder, pseudospins, and backscattering in carbon nanotubes

Details Disorder, pseudospins, and backscattering in carbon nanotubes Disorder, pseudospins, and backscattering in carbon nanotubes

1999-06-04

arxiv.org/abs/cond-mat/9906055v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

four pages

Scientific paper

10.1103/PhysRevLett.83.5098

We address the effects of disorder on the conducting properties of metal and semiconducting carbon nanotubes. Experimentally, the mean free path is found to be much larger in metallic tubes than in doped semiconducting tubes. We show that this result can be understood theoretically if the disorder potential is long-ranged. The effects of a pseudospin index that describes the internal sublattice structure of the states lead to a suppression of scattering in metallic tubes, but not in semiconducting tubes. This conclusion is supported by tight-binding calculations.

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