Subgap structure in the conductance of a three-terminal Josephson junction

A. H. Pfeffer; J. E. Duvauchelle; H. Courtois; R. Mélin; D. Feinberg; F. Lefloch

doi:10.1103/PhysRevB.90.075401

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Subgap structure in the conductance of a three-terminal Josephson junction

A. H. Pfeffer, J. E. Duvauchelle, H. Courtois, R. Mélin, D. Feinberg, F. Lefloch

DOI 10.1103/PhysRevB.90.075401 · Physical Review B

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Abstract

Three-terminal superconductor (S)-normal metal (N)-superconductor (S) Josephson junctions are investigated. In a geometry where a T-shape normal metal is connected to three superconducting reservoirs, new subgap structures appear in the differential resistance for specific combinations of the superconductor chemical potentials. Those correspond to a correlated motion of Cooper pairs within the device that persist well above the Thouless energy and is consistent with the prediction of quartets formed by two entangled Cooper pairs. A simplified nonequilibrium Keldysh-Green's function calculation is presented that supports this interpretation.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown