标题： 自旋电子学太赫兹辐射的定量建模由于超快自旋输运 显示英文标题

标题： Quantitative modeling of spintronic terahertz emission due to ultrafast spin transport

摘要： 在自旋电子学太赫兹发射器中，通过飞秒激光激发铁磁-非磁金属异质结构来产生超快自旋电流，从而生成太赫兹辐射。 尽管在过去十年中已经积累了大量的现象学知识，但将产生的太赫兹信号与激光诱导的自旋电流联系起来的坚实理论模型仍然不完整。 在这里，我们从麦克斯韦方程组的一般解出发，对自旋电子学发射器中由超扩散自旋电流产生的电场进行建模，并以Co/Pt为例。 我们明确考虑了探测器的形状，该形状被证明显著影响检测到的太赫兹辐射。 此外，还考虑了自旋霍尔效应的电子能量依赖性，以及激发激光脉冲的持续时间和探测器晶体的厚度。 我们的建模产生了现实的发射轮廓，并突出了检测方法在区分自旋电子学太赫兹发射的关键特征中的作用。 显示英文摘要

摘要： In spintronic terahertz emitters, THz radiation is generated by exciting an ultrafast spin current through femtosecond laser excitation of a ferromagnetic-nonmagnetic metallic heterostructure. Although an extensive phenomenological knowledge has been built up during the last decade, a solid theoretical modeling that connects the generated THz signal to the laser induced-spin current is still incomplete. Here, starting from general solutions to Maxwell's equations, we model the electric field generated by a superdiffusive spin current in spintronic emitters, taking Co/Pt as a typical example. We explicitly include the detector shape which is shown to significantly influence the detected THz radiation. Additionally, the electron energy dependence of the spin Hall effect is taken into account, as well as the duration of the exciting laser pulse and thickness of the detector crystal. Our modeling leads to realistic emission profiles and highlights the role of the detection method for distinguishing key features of the spintronic THz emission.