Interference effects, universal fluctuations, and crossing phenomena in the intermediate coupling regime: Strongly interacting transport

Abstract

On the basis of the generalized Andenson--Wolff--Hubbard model, a strongly interacting transport is studied systematically in the self-consistent field framework. The oscillation in current, conductance, and magnetization as a function of temperature, voltage/or magnetic field is analyzed in detail. It is shown that there exist various individual mesoscopic behaviors such as the periodic conductance oscillations, Coulomb-staircase, Kondo phase, and the universal conductance fluctuations, as well as the insulating-metallic phenomenon and the multi-Kondo peak assisted Coulomb oscillations. It is predicted that there are many new crossing phenomena, as a result of the competition among the multiple electron--electron scattering, the dissipations, and fluctuations in the out of equilibrium states. Interestingly, the average coupling directly reflects the tunnel current. It is argued that in the weak coupling and the relevant high temperature, the oscillations in the density of states and conductance exhibit new universal fluctuations in behavior and could be generally interpreted as the interference and coherence superposition of electronic waves. Our results are qualitatively in explaining experimental observations.