论文标题
具有非交流性旋转基序对的抗铁磁体中的自旋带的脱落式去除旋转带
Degeneracy removal of spin bands in antiferromagnets with non-interconvertible spin motif pair
论文作者
论文摘要
在没有自旋轨道耦合（SOC）的情况下，反铁磁铁中的能带通常是自旋退化的。最近的研究[物理评论B 102，014422（2020）]确定了即使在零SOC限制中也可以提高这种退化的晶体的形式对称条件。这样的材料可以实现“自旋分解”抗磁性旋转，而无需使用重原子化合物的负担。在这里，我们表明这些形式的对称条件可以用易于访问的本地图案对来解释，例如八面体或四面体，每个基曲线均带有相反的磁矩。与这种自旋基序对的共线抗铁磁铁，其组件既不会通过翻译和空间反演互连，又将显示自旋带的分裂。这种基于真实空间的方法可以实现一种简单的方法来识别和设计具有旋转分裂的材料而无需旋转轨道耦合，并提供有关自旋分裂幅度的见解。
Energy bands in antiferromagnets are generally spin degenerate in the absence of spin-orbit coupling (SOC). Recent studies [Physical Review B 102, 014422 (2020)] identified formal symmetry conditions for crystals for which this degeneracy can be lifted even in the zero SOC limit. Such materials could enable "spin-split" antiferromagnetic spintronics without the burden of use of heavy atom compounds. Here, we show that these formal symmetry conditions can be interpreted in terms of easy-to-visualize local motif pair, such as octahedra or tetrahedra, each carrying opposite magnetic moments. Collinear antiferromagnets with such spin motif pair whose components interconvert by neither translation nor spatial inversion will show splitting of spin bands. Such real-space motif-based approach enables an easy way to identify and design of materials having spin splitting without the need for spin orbit coupling, and offers insights on the magnitude of spin splitting.
