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A ferromagnetic hybrid Weyl semimetal in two dimensions: the monolayer AgCrS2

机译:二维的铁磁杂化外尔半金属:单层AgCrS2

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摘要

Topological quantum phases in two-dimensional materials have been a fascinating research topic since the discovery of graphene. Particularly, the topological quantum phases could appear in two-dimensional magnetic systems. However, identifying concrete materials that host topological quantum phases is still a challenge, especially the magnetic ones. In this work, we propose a novel hybrid Weyl semimetal in two dimensions, the monolayer AgCrS2. We show that this material has a stable ferromagnetic ground state with an in-plane magnetic moment. Particularly, it hosts a hybrid of two Weyl nodes close to the Fermi level: one is a double Weyl point, and the other one is type-II linear Weyl point. The features of their band structure could be inferred from the effective models for them. When the spin-orbital coupling is included, the double Weyl point is gapped. In comparison, the type-II linear Weyl nodes on high-symmetry path can be tuned by controlling the orientation of the magnetization direction. To be specific, the magnetization could change locations of type-II linear Weyl nodes and control its stability. Therefore, our results offer a platform to study novel hybrid of Weyl nodes in two-dimensional ferromagnetic system.
机译:自石墨烯被发现以来,二维材料中的拓扑量子相一直是一个引人入胜的研究课题。特别是,拓扑量子相可能出现在二维磁系统中。然而,识别承载拓扑量子相的具体材料仍然是一个挑战,尤其是磁性材料。在这项工作中,我们提出了一种新型的二维杂化外尔半金属,即单层AgCrS2。结果表明,这种材料具有稳定的铁磁基态和面内磁矩。特别是,它拥有两个接近费米能级的外尔节点的混合体:一个是双外尔点,另一个是II型线性外尔点。从它们的有效模型中可以推断出它们的能带结构特征。当包括自旋轨道耦合时,双外尔点是有间隙的。相比之下,高对称路径上的II型线性外尔节点可以通过控制磁化方向的方向进行调整。具体来说,磁化可以改变II型线性外尔节点的位置并控制其稳定性。因此,我们的研究结果为研究二维铁磁系统中外尔节点的新型杂化提供了平台。

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