Abstract Submitted to the    NANOTUBE'06 Conference:

Metallic Nanotubes and as a Perfect Conductor

Tsuneya Ando

Department of Physics, Tokyo Institute of Technology

ando@phys.titech.ac.jp

XIV. Transport in Nanotubes

Interesting transport properties of carbon nanotubes are reviewed briefly from a theoretical point of view. In metallic nanotubes, in particular, there is no backscattering even in the presence of scatterers unless their potential range is smaller than the lattice constant of a two-dimensional graphite. When there are several bands at the Fermi level, a perfectly conducting channel transmitting through the system without being scattered back exists. There can be various perturbations breaking this symmetry. The perfect channel can easily be destroyed by a small perturbation, while the absence of backscattering is very robust. The inter-wall conductance in double-wall nanotubes is calculated for various incommensurate structures. It is negligibly small due to cancellation among different sites and appears only because of incomplete cancellation in the presence of sharp tube boundaries.

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