论文标题
通过旋转轨道纠缠状态的逆轨道扭矩
Inverse Orbital Torque via Spin-Orbital Entangled States
论文作者
论文摘要
虽然在各种结构中已经通过实验发现了电流引起的扭矩，但到目前为止，其互惠的证据已经缺失。在这里，我们报告了YIG/PT/CUOX（YIG = Y3FE5O12）中强轨道扭矩强的实验证据。通过通过铁磁共振和旋转Seebeck效应将自旋泵送从YIG到PT的自旋电流，我们发现了一个明显的逆旋转霍尔效应信号。虽然信号的一部分被解释为PT中的自旋轨道霍尔效应，但与YIG/PT中的信号相比，我们还发现信号大幅增加。我们将其归因于PT/CUOX界面的逆轨道Rashba-Edelstein效应，由PT中的自旋轨道纠缠状态介导。我们的工作铺平了理解非平衡中旋转轨道纠缠物理的方法，并为轨道设备应用中的轨道电流提供了电气检测的方式。
While current-induced torque by orbital current has been experimentally found in various structures, evidence for its reciprocity has been missing so far. Here, we report experimental evidence of strong inverse orbital torque in YIG/Pt/CuOx (YIG = Y3Fe5O12) mediated by spin-orbital entangled electronic states in Pt. By injecting spin current from YIG to Pt by the spin pumping via ferromagnetic resonance and by the spin Seebeck effect, we find a pronounced inverse spin Hall effect-like signal. While a part of the signal is explained as due to the inverse spin-orbital Hall effect in Pt, we also find substantial increase of the signal in YIG/Pt/CuOx structures compared to the signal in YIG/Pt. We attribute this to the inverse orbital Rashba-Edelstein effect at Pt/CuOx interface mediated by the spin-orbital entangled states in Pt. Our work paves the way toward understanding of spin-orbital entangled physics in nonequilibrium and provides a way for electrical detection of the orbital current in orbitronic device applications.
