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.

4 pages, 3 figures

References in corpus (3)

• Tunable Supercurrent Through Semiconductor Nanowires
• Supercurrent reversal in quantum dots
• Quantum supercurrent transistors in carbon nanotubes

Cited by in corpus (4)

• Quantum interference of edge supercurrents in a two-dimensional topological insulator
• Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
• Symmetry analysis of transport properties in helical superconductor junctions
• Tuning Excess Noise by Aharonov-Bohm Interferometry