Giant intrinsic spin Hall effect in W3Ta and other A15 superconductors
Giant intrinsic spin Hall effect in W3Ta and other A15 superconductors
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DOI：
10.1126/sciadv.aav8575
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发表时间：
2019-04-01
期刊：
影响因子：
13.6
通讯作者：
Ali, M. N.
中科院分区：
文献类型：
--
作者：
Derunova, E.;Sun, Y.;Ali, M. N.
自旋霍尔效应（SHE）是电荷电流到自旋电流的转换，具有大SHE的非磁性金属在自旋电子应用中非常受欢迎，但它们的稀缺性阻碍了它们的广泛应用。在这里，我们预测并解释了β - w和A15超导体家族中的大本征SHE: W3Ta， Ta3Sb和Cr3Ir的自旋霍尔电导率（SHCs）分别为-2250，-1400和1210 h/e （S/cm）。结合拓扑物理学的概念和SHE对电子带的自旋Berry曲率（SBC）的依赖，我们提出了一种基于以下思想的简单策略来快速搜索具有大本征SHE的材料：高对称性与重原子结合导致电子结构中产生多个狄拉克样交叉；如果没有足够的对称保护，这些交叉会由于自旋-轨道耦合而产生间隙；和间隙交叉产生大的SBC。
The spin Hall effect (SHE) is the conversion of charge current to spin current, and nonmagnetic metals with large SHEs are extremely sought after for spintronic applications, but their rarity has stifled widespread use. Here, we predict and explain the large intrinsic SHE in beta-W and the A15 family of superconductors: W3Ta, Ta3Sb, and Cr3Ir having spin Hall conductivities (SHCs) of -2250, -1400, and 1210 h/e (S/cm), respectively. Combining concepts from topological physics with the dependence of the SHE on the spin Berry curvature (SBC) of the electronic bands, we propose a simple strategy to rapidly search for materials with large intrinsic SHEs based on the following ideas: High symmetry combined with heavy atoms gives rise to multiple Dirac-like crossings in the electronic structure; without sufficient symmetry protection, these crossings gap due to spin-orbit coupling; and gapped crossings create large SBC.