发表机构
Hiroshima University; CNRS; RIKEN Center for Emergent Matter Science（广岛大学; 法国国家科学研究中心; 日本理化学研究所新兴物质科学中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究在具有外禀自旋轨道相互作用的SNS结中，数值发现约瑟夫森电流产生自旋霍尔效应，且梯度塞曼场经逆自旋霍尔效应引起异常相移，在高次谐波存在时产生二极管效应，且增强耦合可使其更显著。
AI 中文摘要
在超导体-正常金属-超导体（SNS）结中，当N段具有外禀自旋轨道相互作用时，我们数值研究了平衡态下的自旋密度和约瑟夫森电流。该系统保持结构反演对称性。我们发现约瑟夫森电流产生自旋霍尔效应，导致在N段两个边缘附近出现相反的自旋密度。我们还发现，对N段施加具有梯度的塞曼磁场，由于逆自旋霍尔效应会产生异常相移，当约瑟夫森电流存在高次谐波时，会导致二极管效应。这些结果与先前基于图解微扰理论的理论研究结果一致。我们发现，当N段与S段之间更强的耦合增强了高次谐波时，二极管效应变得更加显著。
英文摘要
The spin density and Josephson current at equilibrium are studied numerically in a superconductor-normal metal-superconductor (SNS) junction with extrinsic spin-orbit interaction in the N segment. This system preserves structural inversion symmetry. We find that the Josephson current generates the spin Hall effect, resulting in an opposite spin density near the two edges of the N segment. We also find that a Zeeman magnetic field with gradient applied to the N segment generates an anomalous phase shift due to the inverse spin Hall effect, resulting in a diode effect when higher harmonics of the Josephson current are present. These results are consistent with those of a previous theoretical study based on diagrammatic perturbation theory. We find that the diode effect becomes more pronounced when stronger coupling between the N and S segments enhances the higher harmonics.
Comments5 pages, 7 figures
