Antiresonance effect due to Stone–Wales defect in carbon nanotubes

Abstract

The transmission coefficient and the local density of states for different carbon nanotubes with a 5–7–7–5 defect (or Stone–Wales defect) are calculated. The results show that the presence of the Stone–Wales defect induces two remarkable dips in the conductance curve, whose energies lie between the first pair of van-Hove singularities (VHSs), and correspondingly, there are two quasibound states induced by the defect. The conductance dips can be understood as a result of the antiresonance scattering of the incident electrons with these quasibound states. Moreover, it is found that the energies of these quasibound states depend on the 1st VHSs of the CNTs as well as the defect orientation, indicates that the origin of these quasibound states can be ascribed to the nearest energy sub-band splitting by the perturbation of the defect.