Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany.
Phys Rev Lett. 2009 Oct 2;103(14):147001. doi: 10.1103/PhysRevLett.103.147001. Epub 2009 Sep 29.
We examine a Josephson junction involving two arbitrary equal-spin-pairing unitary triplet superconductors and a ferromagnetic tunneling barrier. Using perturbation theory, we show how the interaction of the barrier moment with the spin of the tunneling triplet Cooper pairs can reverse the sign of the Josephson charge current. This also results in a Josephson spin current, which contains a phase-independent contribution due to reflection processes at the barrier. We verify our analytic predictions using a nonperturbative Bogoliubov-de Gennes method.
我们研究了一个涉及两个任意等自旋配对的三联超导体和一个铁磁隧道势垒的约瑟夫森结。利用微扰理论，我们展示了势垒磁矩与隧道三重态库珀对自旋的相互作用如何反转约瑟夫森电荷电流的符号。这也导致了约瑟夫森自旋电流，其中由于势垒处的反射过程而存在与相位无关的贡献。我们使用非微扰 Bogoliubov-de Gennes 方法验证了我们的分析预测。
