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arXiv 1907.00539cond-mat.supr-con
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磁性超导体中Higgs模驱动的自旋电流

Spin currents driven by the Higgs mode in magnetic superconductors

Mikhail A. Silaev, Risto Ojajärvi, Tero T. Heikkilä

摘要:

超导材料中的Higgs模描述了序参量振幅的缓慢衰减振荡。我们证明,在磁性超导体与内置的自旋分裂场希格斯模式是强烈耦合的自旋自由度允许产生的时间相关的自旋电流。通过自旋滤波元件将这种自旋电流转换为电信号,为二次谐波产生和外照射产生的Higgs模的电检测提供了工具。由这些自旋电流产生的非绝热自旋力矩允许通过测量相邻铁磁体中的磁矩的进动来对希格斯模式进行磁性检测。我们还讨论了磁旋进产生Higgs模的相互作用。将超导体中的集体模与光和磁动力学耦合,开辟了超导光自旋电子学的新方向。

英文摘要:

Higgs mode in superconducting materials describes slowly-decaying oscillations of the order parameter amplitude. We demonstrate that in magnetic superconductors with built-in spin-splitting field Higgs mode is strongly coupled to the spin degrees of freedom allowing for the generation of time-dependent spin currents. Converting such spin currents to electric signals by spin-filtering elements provides a tool for the second-harmonic generation and the electrical detection of the Higgs mode generated by the external irradiation. The non-adiabatic spin torques generated by these spin currents allow for the magnetic detection of the Higgs mode by measuring the precession of magnetic moment in the adjacent ferromagnet. We discuss also the reciprocal effect which is the generation of the Higgs mode by the magnetic precession. Coupling the collective modes in superconductors to light and magnetic dynamics opens the new direction of superconducting optospintronics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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