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  • Letter

Observation of anomalous Josephson effect in nonequilibrium Andreev interferometers

Daniel Margineda1,2,*, Jill S. Claydon2, Fatjon Qejvanaj2, and Chris Checkley2

  • 1NEST Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127, Pisa, Italy
  • 2York Instruments, LTD, Croton Healthcare, Coral Springs, Florida, 33065, USA

  • *daniel.margineda@nano.cnr.it

Phys. Rev. B 107, L100502 – Published 15 March, 2023

DOI: https://doi.org/10.1103/PhysRevB.107.L100502

Abstract

The evidence of anomalous Josephson effect in superconducting-normal-superconducting (SNS) junctions requiring neither Zeeman splitting nor spin-orbit coupling is reported. We demonstrate that a spontaneous phase emerges by modifying the nonequilibrium conditions of the weak link resembling φ0-junctions. The voltage-controlled phase shift is detected from magnetoresistance measurements of the proximitized wire connected to the weak link forming a crosslike Andreev interferometer. The interplay of Aharanov-Bohm-like and conventional Josephson currents, in agreement with recent predictions, provides the ingredients for the anomalous current-phase relation. These results represent a breakthrough for engineering superconducting nanocircuits with voltage-tunable quantum properties.

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