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We have observed both Kondo-assisted tunneling and simple resonant tunneling via a single charge trap state in the voltage-dependent differential conductance of a point-contact tunnel barrier. From the resonant tunneling signal, we determine parameters of the Anderson model governing the state. This allows comparison of the measured Kondo-assisted signal to results of the Anderson model. The Kondo signal is not adequately described by perturbation theory, but is in qualitative agreement with nonperturbative calculations.
Ralph et al. (Mon,) studied this question.