Department of Physics, University of Crete, Heraklion, Greece.
J Phys Condens Matter. 2010 Nov 10;22(44):445701. doi: 10.1088/0953-8984/22/44/445701. Epub 2010 Oct 22.
We analyse both analytically and numerically a ballistic ferromagnetic Josephson junction with spin active interfaces, focusing on the zero phase difference supercurrent that appears when the magnetizations of the intermediate layer and the interfaces form a non-coplanar set of vectors. We claim that the presence of even one magnetization vector in the system breaks the time reversal invariance of the Hamiltonian, which can lead to a zero phase difference supercurrent, unless the symmetry is restored by a combination of time reversal and a rotational symmetry. This is the case when the magnetizations of the junction form a coplanar set of vectors. We also derive a new formula for the equilibrium supercurrent which is a generalization of our previous work.
我们从理论和数值两方面分析了具有自旋活跃界面的弹道铁磁共振结，重点研究了当中间层磁化和界面形成非共面矢量组时出现的零相位差超导电流。我们声称，系统中即使只有一个磁化矢量的存在也会破坏哈密顿量的时间反转不变性，除非通过时间反转和旋转对称性的组合来恢复对称性。当结的磁化形成共面矢量组时就是这种情况。我们还推导出了一个新的平衡超导电流公式，这是我们之前工作的推广。
