Giant Josephson current through a single bound state in a superconducting tunnel junction
G. Wendin, V. S. Shumeiko
DOI 10.1103/PhysRevB.53.R6006 · Physical Review B
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Abstract
We study the microscopic structure of the Josephson current in a single-mode tunnel junction with a wide quasiclassical tunnel barrier. In such a junction each Andreev bound state carries a current of magnitude proportional to the amplitude of the normal electron transmission through the junction. Tremendous enhancement of the bound-state current is caused by the resonance coupling of superconducting bound states at both superconductor-insulator interfaces of the junction. The possibility of experimental observation of the single bound-state current is discussed.
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