Theoretical study of small-radius carbon nanotubes

James Roberts
carbon nanotubes. The energy band structure of a carbon nanotube may ordinarily be obtained by “zone-folding” the nearest neighbour tight-binding approximation of a flat graphite sheet. Due to the large curvature of a small-radius tube, however, this procedure fails to accurately predict the metallic character of any zigzag nanotube whose diameter is less than 5˚A. To this end, a third-nearest neighbour tight-binding approximation sensitive to the curvature of the tube is presented and an analytic...
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