Spontaneous antisymmetric spin splitting in noncollinear antiferromagnets without spin-orbit coupling
Spontaneous antisymmetric spin splitting in noncollinear antiferromagnets without spin-orbit coupling
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DOI：
10.1103/physrevb.101.220403
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发表时间：
2020-06-02
影响因子：
3.7
通讯作者：
Kusunose, Hiroaki
中科院分区：
文献类型：
--
作者：
Hayami, Satoru;Yanagi, Yuki;Kusunose, Hiroaki
我们提出了一个实现反对称自旋分裂带结构通过磁相变没有自旋轨道耦合。它使我们能够利用它的各种磁顺序驱动的交叉相关和非互易输运现象，类似于那些在自旋轨道耦合取向的系统。我们揭示了它的一般条件作为一个键型磁环多极（极张量）的出现在一个三角形单元与非共线的120度反铁磁结构。通过使用增广多极的概念，我们系统地分析了一个有效的多极耦合的现象。我们的多极描述普遍适用于任何三角形和六边形结构，包括三角形，kagome和呼吸kagome结构，并提供了一种方法来设计和工程材料与一个巨大的反对称自旋分裂及其物理响应，即使没有自旋轨道耦合。
We propose a realization of an antisymmetric spin-split band structure through magnetic phase transitions without spin-orbit coupling. It enables us to utilize it for a variety of magnetic-order-driven cross-correlated and nonreciprocal transport phenomena as similar to those in spin-orbit-coupling oriented systems. We unveil its general condition as an emergence of a bond-type magnetic toroidal multipole (polar tensor) in a triangular unit with noncollinear 120 degrees antiferromagnetic structures. By using the concept of augmented multipoles, we systematically analyze the phenomena in terms of an effective multipole coupling. Our multipole description is ubiquitously applied to any trigonal and hexagonal structures including triangular, kagome, and breathing kagome structures, and provides a way to design and engineer materials with a giant antisymmetric spin splitting and its physical responses even without spin-orbit coupling.