The cluster approach based on the multiple scattering theory formalism, realistic analytical and coherent potentials, as well as effective medium approximation (EMA-CPA), can be effectively used for modeling of nanosized systems. This allows us to calculate the dispersion law E(k), electronic density of states, conductivity, etc. The multiple scattering problems are stated for radial (e.g., quantum dots) and axial (e.g., nanowires, nanotubes) symmetry approaches. Basic attention is paid now for applications on carbon nanotubes (CNTs) of varying morphology, including their contacts with other conducting elements of a nanocircuit, which can be applied for interconnects in a high-speed electronics. The main problems solving for the resistance in CNT junctions with metal particles appear due to the influence of chirality effects in interconnects of single-wall (SW) and multi-wall (MW) CNTs with the fitting metals (Me = Ni, Cu, Ag, Pd, Pt, Au) for a predefined CNT geometry. Using the model of 'effective bonds' as developed in this study within the formalism of Landauer theory, we can predict the resistivity properties for both SW and MW CNT-Me interconnects. We have also developed the model of the inter-wall interaction inside the MW CNTs, which demonstrates possible 'radial current' losses.
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