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arXiv · 1307.4862

Sub-Gap Structure in the Conductance of a Three-Terminal Josephson Junction

Andreas H. Pfeffer·Jean Eudes Duvauchelle·Hervé Courtois·Régis Mélin·Denis Feinberg·François Lefloch
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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 sub-gap 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.

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Andreas H. Pfeffer, Jean Eudes Duvauchelle, Hervé Courtois, Régis Mélin, Denis Feinberg, François Lefloch. 2014-07-06. Sub-Gap Structure in the Conductance of a Three-Terminal Josephson Junction. https://doi.org/10.1103/physrevb.90.075401

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