Abstract
By introducing the s p 3 s * tight-binding model, the band structure and electronic density of states of single-walled carbon nanotubes are calculated. It is found that “metallic” zigzag single-walled carbon nanotubes open gaps about 7 meV–0.2 eV near Fermi level. In addition, the changes of diameter and chiral angles plays important roles in electronic properties of carbon nanotubes, especially of small-diameters tubes.
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