论文标题
在超导体/铁磁绝缘子/超导体连接器中，异常的约瑟夫森霍尔效应电荷和横向自旋电流
Anomalous Josephson Hall effect charge and transverse spin currents in superconductor/ferromagnetic insulator/superconductor junctions
论文作者
论文摘要
约瑟夫森连接中的界面自旋轨道耦合提供了一种有趣的方法，可以将异常大厅和约瑟夫森物理学结合在单个设备中。从理论上讲，这两种效应的叠加如何影响超导体/铁磁绝缘子/超导体连接特性。通过自旋铁磁绝缘子界面对库珀对的横向动量依赖性偏斜隧穿会产生相当大的横向大厅的超电流，我们将其称为异常的Josephson Hall效应电流。我们概括了Furusaki-tsukada公式，该公式最初建立以量化常规（隧道）Josephson电流流，以评估横向电流组件，并证明它们的振幅可通过旋转轨道耦合强度或超超管相位差异广泛调节。作为约瑟夫森连接的清晰光谱指纹，在界面周围形成了良好的子仪结合状态。通过分析这些状态的光谱特性，我们揭示了自旋轨道耦合诱导的能量中的不对称性与横向电流响应之间的明确相关性，从而建立了电流的显微镜起源。此外，偏斜的隧道同时起作用，就像旋转曲线库珀对的横向自旋滤波器，并通过其自旋电流对应物补充了所讨论的电荷电流现象。连接通用的自旋电流电流比例为实验检测和表征界面自旋轨道耦合提供了宝贵的可能性。
Interfacial spin-orbit coupling in Josephson junctions offers an intriguing way to combine anomalous Hall and Josephson physics in a single device. We study theoretically how the superposition of both effects impacts superconductor/ferromagnetic insulator/superconductor junctions' transport properties. Transverse momentum-dependent skew tunneling of Cooper pairs through the spin-active ferromagnetic insulator interface creates sizable transverse Hall supercurrents, to which we refer as anomalous Josephson Hall effect currents. We generalize the Furusaki-Tsukada formula, which got initially established to quantify usual (tunneling) Josephson current flows, to evaluate the transverse current components and demonstrate that their amplitudes are widely adjustable by means of the spin-orbit coupling strengths or the superconducting phase difference across the junction. As a clear spectroscopic fingerprint of Josephson junctions, well-localized subgap bound states form around the interface. By analyzing the spectral properties of these states, we unravel an unambiguous correlation between spin-orbit coupling-induced asymmetries in their energies and the transverse current response, founding the currents' microscopic origin. Moreover, skew tunneling simultaneously acts like a transverse spin filter for spin-triplet Cooper pairs and complements the discussed charge current phenomena by their spin current counterparts. The junctions' universal spin-charge current cross ratios provide valuable possibilities to experimentally detect and characterize interfacial spin-orbit coupling.
