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

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.

preprint2014arXivOpen access
Andreas H. PfefferJean Eudes DuvauchelleHervé CourtoisRégis MélinDenis FeinbergFrançois Lefloch
cond-mat.mes-hall
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Open access6 authors1 topic
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Andreas H. PfefferJean Eudes DuvauchelleHervé CourtoisRégis MélinDenis FeinbergFrançois Lefloch

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