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- Title
Superconducting diode effect sign change in epitaxial Al-InAs Josephson junctions.
- Authors
Lotfizadeh, Neda; Schiela, William F.; Pekerten, Barış; Yu, Peng; Elfeky, Bassel Heiba; Strickland, William M.; Matos-Abiague, Alex; Shabani, Javad
- Abstract
There has recently been a surge of interest in studying the superconducting diode effect (SDE) partly due to the possibility of uncovering the intrinsic properties of a material system. A change of sign of the SDE at finite magnetic field has previously been attributed to different mechanisms. Here, we observe the SDE in epitaxial Al-InAs Josephson junctions with strong Rashba spin-orbit coupling (SOC). We show that this effect strongly depends on the orientation of the in-plane magnetic field. In the presence of a strong magnetic field, we observe a change of sign in the SDE. Simulation and measurement of supercurrent suggest that depending on the superconducting widths, WS, this sign change may not necessarily be related to 0–π or topological transitions. We find that the strongest sign change in junctions with narrow WS is consistent with SOC-induced asymmetry of the critical current under magnetic-field inversion, while in wider WS, the sign reversal could be related to 0–π transitions and topological superconductivity. The superconducting diode effect (SDE) might reveal a material's intrinsic properties. Here a change of sign of the SDE is observed at finite magnetic field in planar Josephson junctions on a hybrid superconductor-semiconductor material.
- Subjects
SPIN-orbit interactions; FINITE fields; DIODES; MAGNETIC fields; SUPERCONDUCTIVITY; JOSEPHSON junctions; CRITICAL currents; TEMPERATURE inversions
- Publication
Communications Physics, 2024, Vol 7, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-024-01618-5