Fractional quantum conductance in carbon nanotubes

Using a scattering technique based on a parametrized linens combination of atomic orbitals Hamiltonian, we calculate the ballistic quantum conductance of multiwall carbon nanotubes. We find that interwall interactions not onl y block some of the quantum conductance channels, but also redistribute the current nonuniformly over individual tubes across the structure. Our resul ts provide a natural explanation for the unexpected integer and noninteger conductance values reported for multiwall nanotubes by Stefan Frank et al.