论文标题
观察远程轨道运输和巨型轨道扭矩
Observation of long-range orbital transport and giant orbital torque
论文作者
论文摘要
现代的自旋三位型依赖于自旋轨道耦合的旋转电流的产生。据信自旋产生是由电流诱导的轨道动力学触发的，该动力学控制着角动量从晶格到固体中电子的转移。轨道反应在角动力动力学中的基本作用表明旋转电流的轨道对应物的重要性：轨道电流。但是，其存在的证据是难以捉摸的。在这里，我们证明了巨型轨道电流的产生以及轨道响应的基本特征。我们在实验和理论上表明，轨道电流在较长距离上的传播比自旋电流在铁磁铁和非磁体中的数量级超过一个数量级。此外，我们发现轨道电流可实现磁化的电动操作，其效率明显高于自旋对应物。这些发现打开了轨道上的大门，该轨道型在固态设备中利用轨道运输和旋转轨道耦合动力学。
Modern spintronics relies on the generation of spin currents through spin-orbit coupling. The spin-current generation has been believed to be triggered by current-induced orbital dynamics, which governs the angular momentum transfer from the lattice to the electrons in solids. The fundamental role of the orbital response in the angular momentum dynamics suggests the importance of the orbital counterpart of spin currents: orbital currents. However, evidence for its existence has been elusive. Here, we demonstrate the generation of giant orbital currents and uncover fundamental features of the orbital response. We experimentally and theoretically show that orbital currents propagate over longer distances than spin currents by more than an order of magnitude in a ferromagnet and nonmagnets. Furthermore, we find that the orbital current enables electric manipulation of magnetization with efficiencies significantly higher than the spin counterpart. These findings open the door to orbitronics that exploits orbital transport and spin-orbital coupled dynamics in solid-state devices.
