Resonant Josephson current
Racah Institute of Physics,
Hebrew University, Jerusalem, 91904, Israel
Accepted: 28 July 1997
It is shown that the resonant Josephson current where both electrons of a Cooper pair tunnel resonantly cannot take place with just one intermediate localized state. A true resonance is possible only if two electrons of a Cooper pair tunnel through two different localized states in the junction with energies close to different edges of the superconducting gap. The tunneling amplitude is not described by the Breit-Wigner formula and its value is strongly affected by the singularity of the density of states in superconductors. This amplitude and the critical current are calculated.
PACS: 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 73.40.Gk – Tunneling
© EDP Sciences, 1997