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

Andreas Pfeffer 1 Jean Eudes Duvauchelle 1 Hervé Courtois 2 Régis Mélin 3 Denis Feinberg 3 Francois Lefloch 1, *
* Corresponding author
1 LaTEQS - Laboratoire de Transport Electronique Quantique et Supraconductivité
PHELIQS - PHotonique, ELectronique et Ingénierie QuantiqueS : DRF/IRIG/PHELIQS
Abstract : Three-terminal superconductor (S)-normalmetal (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.
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Submitted on : Thursday, August 7, 2014 - 3:42:13 PM
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Andreas Pfeffer, Jean Eudes Duvauchelle, Hervé Courtois, Régis Mélin, Denis Feinberg, et al.. Subgap structure in the conductance of a three-terminal Josephson junction. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2014, 90 (7), pp.075401. ⟨10.1103/PhysRevB.90.075401⟩. ⟨cea-01054613⟩

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