Conductance of tubular nanowires with disorder

Electronic transport in nanostructures is often affected by the presence
of impurities. Understanding impurity induced disorder has been a major
concern in the field of quantum transport for many years. In this talk
I will present a calculation of the conductance of a model disordered
nanostructure. Namely, tubular-shaped nanowires with repulsive potential
barriers at random positions. Our approach is based on the scattering matrix
formalism and our results analyzed within the scaling theory of disordered
conductors. When increasing the energy the conductance for a big enough number
of impurities in the tube manifests the system evolution from the localized
to the metallic regimes. Nevertheless, a conspicuous drop in conductance is
predicted whenever a new transverse channel becomes propagating. Comparison
with the semiclassical calculation leading to purely Ohmic behavior is also
made.