Reinhardt S, Ascherl T, Costa A, Berger J, Gronin S, Gardner G C, Lindemann T, Manfra M J, Fabian J, Kochan D, Strunk C, Paradiso N
Institut für Experimentelle und Angewandte Physik, University of Regensburg, Regensburg, Germany.
Institut für Theoretische Physik, University of Regensburg, Regensburg, Germany.
Nat Commun. 2024 May 23;15(1):4413. doi: 10.1038/s41467-024-48741-z.
In Josephson diodes the asymmetry between positive and negative current branch of the current-phase relation leads to a polarity-dependent critical current and Josephson inductance. The supercurrent nonreciprocity can be described as a consequence of the anomalous Josephson effect -a φ-shift of the current-phase relation- in multichannel ballistic junctions with strong spin-orbit interaction. In this work, we simultaneously investigate φ-shift and supercurrent diode efficiency on the same Josephson junction by means of a superconducting quantum interferometer. By electrostatic gating, we reveal a direct link between φ-shift and diode effect. Our findings show that spin-orbit interaction in combination with a Zeeman field plays an important role in determining the magnetochiral anisotropy and the supercurrent diode effect.
在约瑟夫森二极管中，电流-相位关系的正、负电流分支之间的不对称性导致了极性依赖的临界电流和约瑟夫森电感。在具有强自旋-轨道相互作用的多通道弹道结中，超电流的非互易性可被描述为反常约瑟夫森效应（电流-相位关系的φ位移）的结果。在这项工作中，我们借助超导量子干涉仪在同一个约瑟夫森结上同时研究了φ位移和超电流二极管效率。通过静电门控，我们揭示了φ位移与二极管效应之间的直接联系。我们的研究结果表明，自旋-轨道相互作用与塞曼场相结合在确定磁手性各向异性和超电流二极管效应方面起着重要作用。
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