论文标题
在旋转轨道耦合的约瑟夫森连接处，在不同的zeeman场上的临界电流的Fraunhofer振荡
Fraunhofer oscillations of the critical current at a varying Zeeman field in a spin-orbit coupled Josephson junction
论文作者
论文摘要
齐曼相互作用通过约瑟夫森与自旋轨道耦合的正常金属的接触导致自发电流，即使没有任何电压或相位偏置。在二维（2D）电子气体中电子的RASHBA旋转轨道耦合的情况下，这种效应发生在与2D系统平行的Zeeman场和超导接触的平行。同时，当该磁场垂直于触点时，自发电流是不存在的。结果表明，在后一种情况下，它可能在不同的Zeeman Energy处的临界约瑟夫森电流的振荡中表现出来。这些振荡具有Fraunhofer衍射模式的形式。基于与旋转轨道耦合强的旋转轨道耦合以及三维拓扑绝缘子的表面电子的无序2D电子气体的半经典绿色函数计算了相位偏差的约瑟夫森电流。在后一种情况下，发现衍射模式最为明显，而在Rashba气体中，临界电流的振荡较弱。
The Zeeman interaction results in spontaneous current through a Josephson contact with a spin-orbit coupled normal metal, even in the absence of any voltage, or phase bias. In the case of the Rashba spin orbit coupling of electrons in a two-dimensional (2D) electron gas this effect takes place for the Zeeman field which is parallel to the 2D system and to superconducting contacts. At the same time, the spontaneous current is absent when this field is perpendicular to the contacts. It is shown that in the latter case it may manifest itself in oscillations of the critical Josephson current at the varying Zeeman energy. These oscillations have a form of the Fraunhofer diffraction pattern. The Josephson current under the phase bias was calculated based on the semiclassical Green functions for a disordered 2D electron gas with the strong spin orbit coupling, as well as for surface electrons of a three dimensional topological insulator. In the latter case the diffraction pattern was found to be most pronounced, while in the Rashba gas the oscillations of the critical current are weaker.
