Resonant tunneling and long-range proximity effect
Devyatov I. A., Kupriyanov M. Yu.
The critical current of SIS tunnel structures in which the primary current-transport mechanism is a resonant tunneling through a single localized state is calculated from the Gor'kov equations. The critical current is governed by a competition between tunneling and thermal mechanisms for the decay of a state into a localized state. The results found here agree satisfactorily with experimental data. They explain the anomalous proximity effect and also the properties of grain-boundary Josephson junctions made of high-rc superconductors.