Abstract
We study the effect of Coulomb interaction on the average single and double occupancy of a resonant state within an amorphous tunnel junction. Double occupancy occurs only when the width of the energy distribution becomes comparable to the Coulomb interaction. The magnetic field dependence of the normalized conductance does not seem to be sensitive to the magnitude of the on-site Coulomb interaction. Fluctuations in the conductance, on the other hand, are anomalously enhanced in the up-down spin channel when the width of the energy distribution of the localized states is comparable to the Coulomb interaction.
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