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5 October 2023 Superconducting diode effect in InAs/Al Josephson junctions at high in-plane magnetic fields
Javad Shabani
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Proceedings Volume PC12656, Spintronics XVI; PC126560O (2023) https://doi.org/10.1117/12.2679458
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
Nonreciprocal critical current in superconducting Josephson junctions occurs when the critical current Ic depends on the direction the current was swept and can be observed by breaking the time reversal and inversion symmetries in the system. Recently, there has been a surge of interest in studying the superconducting diode effect due to its possible application in electronic circuits, sensors, and detectors. In this work, we study epitaxial InAs/Al Josephson junctions with various superconductor width in the presence of in-plane magnetic fields. By applying a magnetic field parallel to the junction, we observe nonreciprocal critical current which is due to the strong Rashba spin-orbit interaction in the system. However, by reducing the width of the superconducting lead, we observe a change in sign of ΔI=I(+)-I(-) as we increase the in-plane magnetic field. We discuss the possible mechanisms and possibility of finite momentum pairing.
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Javad Shabani "Superconducting diode effect in InAs/Al Josephson junctions at high in-plane magnetic fields", Proc. SPIE PC12656, Spintronics XVI, PC126560O (5 October 2023); https://doi.org/10.1117/12.2679458
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KEYWORDS
Magnetism
Superconductors
Diodes
Numerical simulations
Superconductivity
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