论文标题
二维六边形FEX2（x = Cl，br，i）单层中的磁，电子和光诱导的拓扑特性
The magnetic, electronic, and light-induced topological properties in two-dimensional hexagonal FeX2 (X = Cl, Br, I) monolayers
论文作者
论文摘要
拓扑材料是研究物质和拓扑相变的拓扑阶段的肥沃基础。特别是，对2D材料中新型拓扑阶段的追求正在引起快速增长的关注。在这里，使用Floquet-Bloch理论，我们建议在2D六角形FEX2（X = Cl，Br，I）单层中实现手性拓扑阶段，并在圆形极化光照射下。预计这种2D FEX2单层是动力稳定的，并且具有铁磁和半导体特性。为了在周期性驾驶中捕获磁性半导体的完整拓扑物理学，我们从头算起基于Wannier的紧密结合方法，用于Floquet-Bloch波段，随着光场强度的增加，光诱导的带隙封闭和开口得到了。带有开放边界的平板的计算显示了手性边缘状态的存在。有趣的是，通过调谐光幅度从零变为一个，具有手性边缘状态分支的拓扑转换，表明在当前的floquet-bloch系统中可以诱导高chern数的拓扑浮雕阶段。
Topological materials are fertile ground for investigating topological phases of matter and topological phase transitions. In particular, the quest for novel topological phases in 2D materials is attracting fast growing attention. Here, using Floquet-Bloch theory, we propose to realize chiral topological phases in 2D hexagonal FeX2 (X=Cl, Br, I) monolayers under irradiation of circularly polarized light. Such 2D FeX2 monolayers are predicted to be dynamical stable, and exhibit both ferromagnetic and semiconducting properties. To capture the full topological physics of the magnetic semiconductor under periodic driving, we adopt ab initio Wannier-based tight-binding methods for the Floquet-Bloch bands, with the light-induced band gap closings and openings being obtained as the light field strength increases. The calculations of slab with open boundaries show the existence of chiral edge states. Interestingly, the topological transitions with branches of chiral edge states changing from zero to one and from one to two by tuning the light amplitude are obtained, showing that the topological floquet phase of high Chern number can be induced in the present Floquet-Bloch systems.
