拓扑绝缘体表面态的外部自旋轨道散射引起的自旋轨道力矩:面外磁化

IF 2.9 4区 物理与天体物理 Q2 OPTICS Journal of Nonlinear Optical Physics & Materials Pub Date : 2022-11-02 DOI:10.1088/2515-7639/ac9f6e
Mohsen Farokhnezhad, R. Asgari, D. Culcer
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引用次数: 1

摘要

铁磁体/拓扑绝缘体界面上自旋轨道转矩(SOT)的来源尚不完全清楚。由于存在标量散射势的表面状态,该理论压倒性地集中在埃德尔斯坦效应上。我们研究了表面态的外部自旋轨道(SO)散射对SOT的贡献,重点研究了面外磁化的情况。我们发现,在较大的外部SO参数强度下,SO散射带来了相当大的类场SOT的重整化,超过20%。所得到的SOT表现为费米能量、磁化强度和外在SO强度的函数。类场SOT随无序强度的增加而减小,而类阻尼SOT与杂质密度无关。在实验观察的基础上,我们还确定了外来SO散射对反常霍尔效应的影响。我们的研究结果表明,当磁化在平面外时,外部SO散射是由Edelstein效应引起的表面SOT的重要贡献者。
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Spin-orbit torques due to extrinsic spin-orbit scattering of topological insulator surface states: out-of-plane magnetization
The origins of the spin-orbit torque (SOT) at ferromagnet/topological insulator interfaces are incompletely understood. The theory has overwhelmingly focussed on the Edelstein effect due to the surface states in the presence of a scalar scattering potential. We investigate here the contribution to the SOT due to extrinsic spin-orbit (SO) scattering of the surface states, focusing on the case of an out-of-plane magnetization. We show that SO scattering brings about a sizable renormalization of the field-like SOT, which exceeds 20 % at larger strengths of the extrinsic SO parameter. The resulting SOT exhibits a maximum as a function of the Fermi energy, magnetization, and extrinsic SO strength. The field-like SOT decreases with increasing disorder strength, while the damping-like SOT is independent of the impurity density. With experimental observation in mind we also determine the role of extrinsic SO scattering on the anomalous Hall effect. Our results suggest extrinsic SO scattering is a significant contributor to the surface SOT stemming from the Edelstein effect when the magnetization is out of the plane.
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来源期刊
CiteScore
3.00
自引率
48.10%
发文量
53
审稿时长
3 months
期刊介绍: This journal is devoted to the rapidly advancing research and development in the field of nonlinear interactions of light with matter. Topics of interest include, but are not limited to, nonlinear optical materials, metamaterials and plasmonics, nano-photonic structures, stimulated scatterings, harmonic generations, wave mixing, real time holography, guided waves and solitons, bistabilities, instabilities and nonlinear dynamics, and their applications in laser and coherent lightwave amplification, guiding, switching, modulation, communication and information processing. Original papers, comprehensive reviews and rapid communications reporting original theories and observations are sought for in these and related areas. This journal will also publish proceedings of important international meetings and workshops. It is intended for graduate students, scientists and researchers in academic, industrial and government research institutions.
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