Zero phase difference supercurrent in ferromagnetic Josephson junctions
Zero phase difference supercurrent in ferromagnetic Josephson junctions
复制标题
铁磁约瑟夫森结中的零相位差超电流
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
N. Flytzanis
中科院分区：
文献类型：
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作者：
I. Margaris;V. Paltoglou;N. Flytzanis
我们分析了解析和数值计算的弹道铁磁约瑟夫森结与自旋活动的接口，专注于零相位差超导电流时出现的中间层和接口的磁化形成一个非共面的矢量集。我们声称，即使在系统中的一个磁化矢量的存在打破了时间反演不变性的哈密顿量，这可能导致零相位差的超电流，除非对称性恢复的时间反演和旋转对称性的组合。这是当结的磁化形成一组共面矢量时的情况。我们还导出了一个新的平衡超电流公式，它是我们以前工作的推广。
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.