论文标题
偏斜散发诱导的巨型抗压型旋转轨道扭矩：在二维材料/铁磁铁接口处的界线和面外埃德尔斯坦效应
Skew-scattering-induced giant antidamping spin-orbit torques: Collinear and out-of-plane Edelstein effects at two-dimensional material/ferromagnet interfaces
论文作者
论文摘要
重金属/铁磁界面具有散装材料中不存在的新兴自旋轨道效应。由于它们在自旋，电荷和轨道自由度之间固有的强耦合，因此此类系统为技术享受的自旋轨道扭矩（SOT）提供了平台。然而，纯粹的界面抗体SOT的微观起源，尤其是在最终的原子较薄的极限中，已经被证明是难以捉摸的。在这里，使用二维（2D）范德华材料作为界面现象的测试床，我们通过一个微观框架解决了这个问题，该框架考虑了带状结构效应和杂质散射在相等的基础上和非驱动性上。预测了许多非常规和可测量的效果，其中最引人注目的是由强大的偏斜散射机制引起的稀释疾病极限中的抗抑郁剂SOT的巨大增强，该机制在逼真的接口中起作用，并且不需要磁性杂质。新近揭开的偏斜散射机制激活了文献中未引起注意的丰富的半经典旋转转换效应，其中包括与施加电流方向对齐的非平衡自旋极化的共线eDelstein效应。
Heavy metal/ferromagnet interfaces feature emergent spin-orbit effects absent in the bulk materials. Because of their inherent strong coupling between spin, charge and orbital degrees of freedom, such systems provide a platform for technologically sought-after spin-orbit torques (SOTs). However, the microscopic origin of purely interfacial antidamping SOT, especially in the ultimate atomically thin limit, has proven elusive. Here, using two-dimensional (2D) van der Waals materials as a testbed for interfacial phenomena, we address this problem by means of a microscopic framework accounting for band structure effects and impurity scattering on equal footing and nonperturbatively. A number of unconventional and measurable effects are predicted, the most remarkable of which is a giant enhancement of antidamping SOT in the dilute disorder limit induced by a robust skew scattering mechanism, which is operative in realistic interfaces and does not require magnetic impurities. The newly unveiled skew scattering mechanism activates rich semiclassical spin-charge conversion effects that have gone unnoticed in the literature, including a collinear Edelstein effect with nonequilibrium spin polarization aligned with the direction of the applied current.
