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Quasiclassical theory for interfaces with spin-orbit coupling

机译：自旋轨道耦合界面的准经典理论

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摘要

In recent years, substantial progress has been made regarding the application of quasiclassical theory on superconducting hybrid structures. This theoretical framework is reliant on a proper set of boundary conditions in order to describe multilayered systems. With the advent of the field of superconducting spintronics, systems that combine heavy metal layers, in which there is large spin-orbit coupling, with ferromagnets have received a great deal of attention, due to their potential for generating long-range triplet superconductivity. In contrast to interfaces of strongly spin-polarized materials, which are well understood, a quasiclassical theory for interfaces in systems in which there is significant spin-orbit coupling does not yet exist. After reviewing the quasiclassical theory for interfaces, we solve this problem here by deriving a set of boundary conditions that take spin-orbit coupling explicitly into account. We then go on to apply these boundary conditions to a superconductor-ferromagnet bilayer and a superconductor-ferromagnet-superconductor Josephson weak link, demonstrating the emergence of long-range triplet superconductivity in these systems.
机译：近年来，关于准经典理论在超导混合结构上的应用已取得实质性进展。该理论框架依赖于一组适当的边界条件，以描述多层系统。随着超导自旋电子学领域的出现，结合了重金属层（其中存在较大的自旋轨道耦合）和铁磁体的系统由于具有产生远距离三重态超导性的潜力而备受关注。与众所周知的强自旋极化材料的界面相反，尚不存在系统中存在明显自旋轨道耦合的界面的准经典理论。在回顾了界面的准经典理论之后，我们在这里通过导出一组边界条件解决了这个问题，这些边界条件明确考虑了自旋-轨道耦合。然后，我们继续将这些边界条件应用于超导体-铁磁体双层和超导体-铁磁体-超导体约瑟夫森薄弱环节，证明了这些系统中长距离三重态超导性的出现。

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  • 来源
    《Physical review》 |2019年第6期|64502.1-64502.12|共12页
  • 作者

    Amundsen Morten; Linder Jacob;

  • 作者单位

    Norwegian Univ Sci & Technol Ctr Quantum Spintron Dept Phys NO-7491 Trondheim Norway;

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