D.C. Josephson transport by quartets and other Andreev resonances in superconducting bijunctions

Abstract

Bijunctions are three-terminal Josephson junctions where three superconductors are connected by a single weak link made of a metallic region or of quantum dots. Biasing two of the superconductors with commensurate voltages yields Andreev resonances that produce d.c. Josephson currents made of correlated Cooper pairs. For instance with applied voltages (0, V,-V), quartets formed by two entangled Cooper pairs are emitted by one reservoir towards the two others. Theory involving non-equilibrium Green's functions reveal the microsopic mechanism at play, e.g. multiple coherent Andreev reflections that provide an energy-conserving and fully coherent channel. Recent experiments on diffusive Aluminum-Copper bijunctions show transport anomalies that are interpreted in terms of quartet resonances.

7 pages, 8 figures, Proceedings of the Low Temperature Physics Conference LT27, Buenos Aires 2014

References in corpus (7)

• Evidence for crossed Andreev reflection in superconductor-ferromagnet hybrid structures
• Non-Local Correlations in Normal Metal-Superconducting Systems
• Production of non-local quartets and phase-sensitive entanglement in a superconducting beam splitter
• Current and noise correlations in a double dot Cooper pair beam splitter
• Voltage-induced Shapiro steps in a superconducting multi-terminal structure
• Multiple Andreev reflections in hybrid multiterminal junctions
• Crossed conductance in FSF double junctions: role of out-of-equilibrium populations