Inverse Altermagnetic Spin Splitting Effect-Induced Terahertz Emission in RuO2,Advanced Optical Materials

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Inverse Altermagnetic Spin Splitting Effect-Induced Terahertz Emission in RuO2
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-05-24 , DOI: 10.1002/adom.202300177
Yu Liu ₁ , Hua Bai ₂ , Yuna Song ₁ , Zhihao Ji ₁ , Shitao Lou ₃ , Zongzhi Zhang ₁ , Cheng Song ₂ , Qingyuan Jin _{1,

3}

Affiliation

The relativistic inverse spin Hall effect (ISHE) plays a pivotal role in terahertz (THz) emission in magnet/heavy metal bilayers. Here, THz emission from RuO₂/Py bilayers is reported due to not only the relativistic ISHE but also the nonrelativistic inverse altermagnetic spin splitting effect (IASSE) in RuO₂. For the (100)-oriented RuO₂/Py bilayers, the THz emission is greatly enhanced owing to IASSE once the polarization direction of the spin current (from the Py layer induced by pump laser) is parallel to the Néel vector of RuO₂, producing the anisotropic THz emission with twofold symmetry. In contrast, the RuO₂(110)/Py bilayer only exhibits isotropic THz emission because of the absence of IASSE-induced spin-charge conversion in the (110)-oriented RuO₂ films. Apart from the fundamental significance of exploring the IASSE-induced spin-to-charge conversion, the finding also enriches the physical mechanism and modulation method of THz emission in spintronic systems.

中文翻译：

RuO2 中逆交变磁自旋分裂效应引起的太赫兹发射

相对论逆自旋霍尔效应（ISHE）在磁体/重金属双层太赫兹（THz）发射中发挥着关键作用。在此，报道了RuO _{2 /Py双层的太赫兹发射，这不仅是由于RuO}₂中的相对论性ISHE，而且还由于非相对论性逆交变磁自旋分裂效应(IASSE) 。对于（100）取向的 RuO ₂ /Py 双层，一旦自旋电流（来自泵浦激光诱导的 Py 层）的偏振方向平行于 RuO 2 的 Néel 矢量，由于 IASSE，太赫兹发射大大_增强，产生具有双重对称性的各向异性太赫兹发射。相比之下，RuO ₂(110)/Py双层仅表现出各向同性太赫兹发射，因为(110)取向的RuO ₂薄膜中不存在IASSE诱导的自旋电荷转换。这一发现除了探索IASSE诱导的自旋电荷转换具有根本意义外，还丰富了自旋电子系统中太赫兹发射的物理机制和调制方法。

更新日期：2023-05-24

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