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5 October 2023 Supercurrent nonreciprocity and vortex formation in superconductor heterostructures
Leonid Rokhinson
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Proceedings Volume PC12656, Spintronics XVI; PC126560P (2023) https://doi.org/10.1117/12.2676216
Event: SPIE Nanoscience + Engineering, 2023, San Diego, California, United States
Abstract
In this work we show that critical current nonreciprocity (CCN) is a generic effect of superconductor heterostructures and is related to the formation of diamagnetic currents by an external magnetic field in the presence of phase locking between superconducting layers due to the Josephson coupling. We demonstrate this so-called superconducting diode effect in nanowires fabricated from InAs/Al heterostructures, where superconductivity in InAs is induced via proximity effect from an Al layer. The observed CCN is linear at small in-plane magnetic fields and becomes non-monotonic function of magnetic field and changes sign at high fields. We attribute CCN nonmonotonic behavior to the formation of Josephson vortices. The studied InAs/Al and analogous heterostructures are positioned as the most promising platform to search for non-Abelian excitations, the observed formation of Josephson vortices and corresponding phase twists at high magnetic fields may need to be taken into account in the future device designs.
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Leonid Rokhinson "Supercurrent nonreciprocity and vortex formation in superconductor heterostructures", Proc. SPIE PC12656, Spintronics XVI, PC126560P (5 October 2023); https://doi.org/10.1117/12.2676216
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KEYWORDS
Heterojunctions
Superconductors
Magnetism
Aluminum
Diodes
Indium arsenide
Mode locking
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