FERMI-LIQUID ANALYSIS ON A WOLFF MODEL FOR RESONANT-TUNNELING THROUGHA SINGLE QUANTUM LEVEL

An impurity Wolff model on a one-dimensional lattice, which has been p roposed as a model for correlation effects in resonant tunneling throu gh a single quantum level, is studied with a microscopic Fermi-Liquid theory. Specifically, we derive the expression for the conductance in terms of the phase shift based on the Kubo formula applying the analys is for the correlation functions, which was originally used to derive the Korringa relation in Kondo alloys, to the current correlation func tion. At T = 0, the contributions of the vertex corrections to the cor relation function for local currents are aero independent of spatial p oints at which the currents are measured. Consequently, as a function of the phase shift, the conductance can be written in the same form as that for noninteracting electrons, and the Coulomb interaction affect s the conductance through the self-energy corrections included in the phase shift.