论文标题
强烈的自旋轨道扭矩效果对拓扑表面状态电子在bi $ _ {2} $ te $ _ {3} $中引起的磁缺损效果
Strong Spin-Orbit Torque effect on magnetic defects due to topological surface state electrons in Bi$_{2}$Te$_{3}$
论文作者
论文摘要
我们研究了嵌入拓扑金属杂质Cr，Mn，Fe和CO上施加的自旋轨道扭矩，该扭矩嵌入了拓扑绝缘子BI $ _ {2} $ _ {2} $ te $ _ {3} $的表面中，以响应电场，并在表面上流动电流。电子杂质原子的多个散射问题是通过全势相对论Korringa-kohn-rostoker（KKR）绿色功能方法中的第一原理计算来解决的，而旋转轨道扭矩计算是通过将KKR方法与半级Boltzmann传输方程相结合来实现的。我们分析了自旋轨道扭矩与缺陷中自旋积累和自旋通量的相关性。我们比较了不同磁性杂质的扭矩，并揭示了共振散射的效果。此外，我们计算了这些系统中扭矩的电阻率和焦点热量。我们预测MN/BI $ _ {2} $ TE $ _ {3} $在研究系统中是最佳的。
We investigate the spin-orbit torque exerted on the magnetic moments of the transition-metal impurities Cr, Mn, Fe and Co, embedded in the surface of the topological insulator Bi$_{2}$Te$ _{3} $, in response to an electric field and a consequent electrical current flow in the surface. The multiple scattering problem of electrons off impurity atoms is solved by first-principles calculations within the full-potential relativistic Korringa-Kohn-Rostoker (KKR) Green function method, while the spin-orbit torque calculations are carried out by combining the KKR method with the semiclassical Boltzmann transport equation. We analyze the correlation of the spin-orbit torque to the spin accumulation and spin flux in the defects. We compare the torque on different magnetic impurities and unveil the effect of resonant scattering. In addition, we calculate the resistivity and the Joule heat as a function of the torque in these systems. We predict that the Mn/Bi$_{2}$Te$_{3}$ is optimal among the studied systems.
