论文标题
平方晶格上的P轨磁拓扑状态
P-orbital magnetic topological states on square lattice
论文作者
论文摘要
对蜂窝或三角形晶格进行了广泛的研究，并被认为是实现量子异常效应（QAHE）的适当平台，其中磁性通常是由过渡金属的D轨道引起的。在这里，我们建议方格可以容纳三个磁性拓扑状态，包括完全自旋的偏光性淋巴结环半学，QAHE和拓扑琐碎的铁磁半导体，就对称性和K $ \ cdot $ P模型分析而言，与材料无关。提出了一个相图。我们进一步表明，上述三个磁性拓扑状态确实可以分别分别以二维（2D）材料SCLICL5，LISCZ5（Z = CL，BR）和SCLIBR5实现。这些2D材料中的铁磁材料是从卤素原子的P电子中揭示的。本研究为探索外来拓扑状态以及通过材料无关的方法从P轨道电子中探索外来拓扑状态以及量子磁性的大门。
Honeycomb or triangular lattices were extensively studied and thought to be proper platforms for realizing quantum anomalous Hall effect (QAHE), where magnetism is usually caused by d orbitals of transition metals. Here we propose that square lattice can host three magnetic topological states, including the fully spin polarized nodal loop semimetal, QAHE and topologically trivial ferromagnetic semiconductor, in terms of the symmetry and k$\cdot$p model analyses that are materials-independent. A phase diagram is presented. We further show that the above three magnetic topological states can be indeed implemented in two-dimensional (2D) materials ScLiCl5, LiScZ5 (Z=Cl, Br), and ScLiBr5, respectively. The ferromagnetism in these 2D materials is microscopically revealed from p electrons of halogen atoms. This present study opens a door to explore the exotic topological states as well as quantum magnetism from p-orbital electrons by means of the materials-independent approach.
