Spin–charge conversion is a spin–orbit coupling phenomena where electrical currents can generate transverse spin currents and vice versa. It is one of the central topics in spintronics and widely applied to manipulate the spin and charge degrees of freedom in materials. Previous research on spin–charge conversion was mainly carried out by transport measurements, which lies in the (quasi)equilibrium and DC/low-frequency limit. The recent development of THz emission spectroscopy applied to this field provides additional insights into the dynamics of the spin–charge conversion process, i.e., its ultrafast timescales. Here, the underlying physics and the latest progress of THz studies on spintronics are introduced. The technical details and some features of this technique are summarized, including spin current generation, signal detection, and data analysis. Finally, some possible developments are discussed as well as future research and applications.

中文翻译：

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使用太赫兹脉冲研究自旋电荷转换

自旋电荷转换是一种自旋轨道耦合现象，其中电流可以产生横向自旋电流，反之亦然。它是自旋电子学的核心主题之一，广泛应用于操纵材料中的自旋和电荷自由度。先前关于自旋电荷转换的研究主要通过输运测量进行，其位于（准）平衡和直流/低频极限。应用于该领域的太赫兹发射光谱的最新发展为自旋电荷转换过程的动力学提供了额外的见解，即其超快时间尺度。这里介绍了自旋电子学太赫兹研究的基础物理和最新进展。总结了该技术的技术细节和一些特点，包括自旋电流的产生、信号检测、和数据分析。最后，讨论了一些可能的发展以及未来的研究和应用。