Spin manipulation by giant valley-Zeeman spin-orbit field in atom-thick WSe2
Spin manipulation by giant valley-Zeeman spin-orbit field in atom-thick WSe2
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DOI：
10.1063/5.0089162
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发表时间：
2022-05
影响因子：
15
通讯作者：
Xinhe Wang;Wei Yang;Wang Yang;Yuan Cao;Xiaoyang Lin;Guodong Wei;Haichang Lu;Peizhe Tang;Weisheng Zhao
中科院分区：
文献类型：
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作者：
Xinhe Wang;Wei Yang;Wang Yang;Yuan Cao;Xiaoyang Lin;Guodong Wei;Haichang Lu;Peizhe Tang;Weisheng Zhao
源自自旋轨道耦合的现象为自旋操纵和设备应用提供了节能策略。破坏的反演对称界面和由此产生的电场会产生 Rashba 型自旋轨道场 (SOF)，该场已被证明可以为数据存储应用产生自旋轨道扭矩。在这项研究中，我们发现室温下单层WSe2中的谷-塞曼SOF可以实现自旋翻转，这表现为垂直自旋阀中的负磁阻。基于WSe2 K谷附近的有效模型的量子传输计算证实了巨型SOF下载流子的进动自旋传输，估计为650 T。特别是，谷-塞曼SOF引起的自旋动力学被证明可以随WSe2的层数、堆叠相位以及栅极电压进行调节，这为自旋操纵提供了一种新颖的策略，有利于超低功率自旋电子学的发展 设备。
The phenomenon originating from spin–orbit coupling provides energy-efficient strategies for spin manipulation and device applications. The broken inversion symmetry interface and the resulting electric field induce a Rashba-type spin–orbit field (SOF), which has been demonstrated to generate spin–orbit torque for data storage applications. In this study, we found that spin flipping can be achieved by the valley-Zeeman SOF in monolayer WSe2 at room temperature, which manifests as a negative magnetoresistance in the vertical spin valve. Quantum transmission calculations based on an effective model near the K valley of WSe2 confirm the precessional spin transport of carriers under the giant SOF, which is estimated to be 650 T. In particular, the valley-Zeeman SOF-induced spin dynamics was demonstrated to be tunable with the layer number and stacking phase of WSe2 as well as the gate voltage, which provides a novel strategy for spin manipulation and can benefit the development of ultralow-power spintronic devices.