论文标题
二维COSE结构：内在磁性，可应变的各向异性山谷，磁性Weyl点和抗磁性金属态
Two-dimensional CoSe structures: Intrinsic magnetism, strain-tunable anisotropic valleys, magnetic Weyl point, and antiferromagnetic metal state
论文作者
论文摘要
低维度的磁性，带拓扑和电子相关性之间的相互作用一直是一个引人入胜的研究主题。在这里，我们提出了二维（2D）材料系统，这些系统证明了这种有趣的相互作用。基于第一原理的计算和结构搜索算法，我们确定了三个最低能量2D COSE结构，称为$α$ - ，$β$ - 和$γ$ - cose。 {我们表明$α$ - 和$β$ cose是两个罕见的2D抗磁性金属的例子，与其费米表面嵌套特征有关，同时，$γ$ cosos是铁磁金属。它们具有一系列有趣的物理特性，包括通过结晶对称性，可应变的山谷极化，应变诱导的金属 - 控感和/或磁性相变的各向异性阀，以及磁性温度的特征，例如磁性Weyl Point和磁性Weyl循环。值得注意的是，这里的所有拓扑特征都与自旋轨道耦合相比。}已经讨论了我们预测的一些实验方面。
The interplay between magnetism, band topology, and electronic correlation in low dimensions has been a fascinating subject of research. Here, we propose two-dimensional (2D) material systems which demonstrate such an interesting interplay. Based on first-principles calculations and structural search algorithms, we identify three lowest energy 2D CoSe structures, termed as the $α$-, $β$-, and $γ$-CoSe. {We show that $α$- and $β$-CoSe are two rare examples of 2D antiferromagnetic metals, which are related to their Fermi surfaces nesting features, and meanwhile, $γ$-CoSe is a ferromagnetic metal. They possess a range of interesting physical properties, including anisotropic valleys connected by crystalline symmetries, strain-tunable valley polarization, strain-induced metal-semiconductor and/or magnetic phase transitions, as well as topological band features such as the magnetic Weyl point and the magnetic Weyl loop. Remarkably, all the topological features here are robust against spin-orbit coupling.} Some experimental aspects of our predictions have been discussed.
