Abstract
We study the eAect of on-site Coulomb repulsion on the process of resonant tunneling. We find that the tunneling peak results from a crossover from the high-temperature Kondo phase to the lowtemperature mixed-valence phase of the system when the chemical potential is varied across the on-site localized-state energy. Consequently, the line shape is non-Lorentzian, with rather unusual temperature dependence. Moreover, a magnetic field does not split the tunneling peak, but the line shape is modified. The eAect of coupling between localized states is also discussed, PACS numbers: 71.55.Jv, 73.40.QV In this Letter we discuss the effect of intra-atomic Coulomb interaction on the resonant site in the process of resonant tunneling. Resonant tunneling is thought to be the dominating mechanism for conduction at very low temperature through small systems with localized states. ' In the noninteracting case, this mechanism has been discussed by a number of authors and the phenomenon can be described by a 1D model Hamiltonian Hp, r
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