Switching the sign of Josephson current through Aharonov-Bohm interferometry

Abstract

We investigate the DC Josephson effect in a superconductor-normal metal-superconductor junction where the normal region consists of a ballistic ring. We show that a fully controllable $\pi$-junction can be realized through the electro-magnetostatic Aharonov-Bohm effect in the ring. The sign and the magnitude of the supercurrent can be tuned by varying the magnetic flux and the gate voltage applied to one arm, around suitable values. The implementation in a realistic set-up is discussed.

arXiv comment4 pages, 3 figures

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• Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
• Proximity effect in a two dimensional electron gas probed with a lateral quantum dot
• Josephson current transport through a Quantum Dot in an Aharonov-Bohm Ring
• Symmetry analysis of transport properties in helical superconductor junctions
• Quantum Reflection and Transmission in Ring Systems with Double Y-Junctions: Occurrence of Perfect Reflection
• Zero-phase-difference Josephson current based on spontaneous symmetry-breaking via parametric excitation of a movable superconducting dot
• Tuning Excess Noise by Aharonov-Bohm Interferometry