Abstract

The effect of on-site Coulomb repulsion on the process of resonant tunneling is studied in the tight-binding model of a quasi-one-dimensional system. The conductance through a small region where the Coulomb interaction is strong is calculated as a function of chemical potential with use of the Kubo formula. The Green's function and the number of electrons in the region are obtained self-consistently using the recursion method in the mean-field approximation. It is found that the conductance shows various doublet structures depending on the broadening of the virtual bound state and the Coulomb interaction.

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