Kondo resonance in tunneling phenomena through a single quantum level

Effects of Coulomb repulsion on the process of resonant tunneling through a single quantum level are studied by applying the quantum Monte Carlo method and the maximum-entropy method to the Wolf model on a one-dimensional chain. In the calculated spectral function there is a sharp Kondo peak near the chemical potential \ensuremath{\mu}, which contributes to the resonance tunneling. Correspondingly, the conductance calculated by using the Friedel sum rule shows the expected transparency, i.e., the transmission probability is almost unity when \ensuremath{\mu} is in the range ${\mathrm{\ensuremath{\epsilon}}}_{0}$${\mathrm{\ensuremath{\epsilon}}}_{0}$+U, where ${\mathrm{\ensuremath{\epsilon}}}_{0}$ is the on-site energy of the single quantum level and U is the Coulomb repulsion.