The Higgs mode in superconducting materials describes slowly decaying oscillations of the order parameter amplitude. We demonstrate that in superconductors with a built-in spin-splitting field the 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 nonadiabatic spin torques generated by these spin currents allow for the magnetic detection of the Higgs mode by measuring the precession of the 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 provides an opportunity for the study of superconducting optospintronics.

中文翻译：

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高场超导体中希格斯模式驱动的自旋和充电电流

超导材料中的希格斯模式描述了阶次参数幅度的缓慢衰减的振荡。我们证明，在具有内置自旋分裂场的超导体中，希格斯模式与自旋自由度密切相关，从而允许生成随时间变化的自旋电流。通过自旋滤波元件将这种自旋电流转换为电信号，为二次谐波的产生以及由外部辐射产生的希格斯模式的电学检测提供了一种工具。通过测量相邻铁磁体中磁矩的进动，由这些自旋电流产生的非绝热自旋扭矩可对希格斯模式进行磁检测。我们还将讨论互惠效应，这是由磁旋进产生的希格斯模式。