The transmission coefficient and the local density of states for various carbon nanotubes with a 5-7-7-5 (Stone-Wales) defect were calculated. The results showed that the presence of the Stone-Wales defect introduced two marked dips, in the conductance curve, whose energies lay between the first pair of van-Hove singularities. There were two corresponding quasi-bound states introduced by the defect. The conductance dips could be understood as being a result of antiresonance scattering of the incident electrons with these quasi-bound states. It was found that the energies of these quasi-bound states depended upon the 1st van-Hove singularities of the carbon nanotubes, as well as upon the defect orientation. This indicated that the origin of these quasi-bound states could be attributed to the nearest energy sub-band splitting by perturbation of the defect.

Antiresonance Effect Due to Stone-Wales Defect in Carbon Nanotubes. H.T.Yang, L.Yang, J.Chen, J.Dong: Physics Letters A, 2004, 325[3-4], 287-93