Nonreciprocal Josephson current through a conical magnet

Lina Johnsen Kamra, Liang Fu
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Abstract

Superconductors can form ideal diodes carrying nondissipative supercurrents in the forward direction and dissipative currents in the backward direction. The Josephson diode has proven to be a promising design where the junction between the two superconductors comprises the weakest link and thus provides the dominant mechanism. We here propose a Josephson diode based on a single magnetic material with a conical spin structure. The helical spin rotation produces Rashba-like band splitting inversely proportional to the rotation period. Together with the Zeeman splitting caused by the time-reversal symmetry breaking of the noncoplanar spin texture, this results in a large diode efficiency close to the $0-\pi$ transition of the magnetic Josephson junction.
通过锥形磁体的非互易约瑟夫森电流
事实证明,约瑟夫森二极管是一种很有前途的设计,其中两个超导体之间的交界处是最薄弱的环节,因此提供了最主要的机制。我们在此提出一种基于具有锥形自旋结构的单一磁性材料的约瑟夫森二极管。螺旋自旋产生的拉什巴带分裂与旋转周期成反比。再加上非共面自旋纹理的时间反转对称性破坏所引起的泽曼分裂,这就导致了在磁性约瑟夫森结的$0-\pi$转变附近产生了很大的二极管效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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