A study was made of the conductance of metallic nano-tubes, with vacancies and pentagon-heptagon pair defects, within the Landauer formalism. By using a tight-binding model and a Green’s function technique to calculate the scattering matrix, an examination was made of a 1-dimensional to 2-dimensional cross-over in these systems. The existence of metallic tube junctions, in which conductance was suppressed for symmetry reasons, was demonstrated.

L.Chico, L.X.Benedict, S.G.Louie, M.L.Cohen: Physical Review B, 1996, 54[4], 2600-6