The exact form of the Green's function in the armchair-type carbon nanotube with the tight-binding Hamiltonian is derived and the analytic expressions for the conductance of the nanotube with local perturbations are obtained. The results show the explicit functional dependence of the conductance on the Fermi level, the tubular radius, and the strength of the perturbations. The change of on-site energy at one or two atomic sites as an examples is considered. Eventhough, the exact form of the Green's function and the computational scheme for the conductance may be used for any kinds of local defects including topological defects, such as the pentagon-heptagon-pair defect.
Bibliographical noteFunding Information:
This work was supported by the MOST-FOTD Project, the BSRI Program of the KRF, and the SRC program of the KOSEF.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry