论文标题
非共线性抗磁性WEYL半含量CO1/3TAS2中的场可触发环形力矩和异常霍尔效应
Field-tunable toroidal moment and anomalous Hall effect in noncollinear antiferromagnetic Weyl semimetal Co1/3TaS2
论文作者
论文摘要
将磁性与带拓扑结合在一起提供了各种新的阶段，否则这些阶段是不可能的。在几种情况下，非共线金属抗铁磁铁可以揭示由于其多样的磁接地态而特别丰富的拓扑物理学。但是，由于缺乏合适的材料，尤其是三角晶格抗铁磁铁，只有少数实验研究。在这里，我们报告说，金属三角形抗铁磁铁CO1/3TAS2表现出与其非共线磁性相关的实质性霍尔效应（AHE）。我们的第一原理计算发现，来自非晶状体对称性触发AHE的沙漏Weyl Fermions。我们进一步表明，CO1/3TAS2中的AHE可以以环形力矩为特征，环形时刻是一种涡旋状的多极组件，它来自手性晶格和几何挫败感的结合。最后，环形力矩的异常场合可容纳可将CO1/3TAS2作为罕见的非共线金属抗铁磁铁的罕见例子，充满了有趣的磁性和拓扑特性。
Combining magnetism with band topology provides various novel phases that are otherwise impossible. Among several cases, noncollinear metallic antiferromagnets can reveal particularly rich topological physics due to their diverse magnetic ground states. However, there are only a few experimental studies due to the lack of suitable materials, especially with triangular lattice antiferromagnets. Here, we report that metallic triangular antiferromagnet Co1/3TaS2 exhibits a substantial anomalous Hall effect (AHE) related to its noncollinear magnetic order. Our first-principles calculations found that hourglass Weyl fermions from the non-symmorphic symmetry trigger AHE. We further show that AHE in Co1/3TaS2 can be characterized by the toroidal moment, a vortex-like multipole component that arises from a combination of chiral lattice and geometrical frustration. Finally, the unusual field-tunability of the toroidal moment puts Co1/3TaS2 as a rare example of a noncollinear metallic antiferromagnet filled with interesting magnetic and topological properties.
