论文标题
二维铬生物座：一种带有可调磁光响应的室温ISING ISING FERROMAGNET
Two-dimensional chromium bismuthate: A room-temperature Ising ferromagnet with tunable magneto-optical response
论文作者
论文摘要
我们介绍了基于密度功能理论（DFT）的研究，对铬植酸铬（CRBI）的二维相（以前未知的材料具有特殊的磁性和磁性特征）。 Monolayer CrBi is a ferromagnetic metal with strong spin-orbit coupling induced by the heavy bismuth atoms, resulting in a strongly anisotropic Ising-type magnetic ordering with the Curie temperature estimated to be higher than 300 K. The electronic structure of the system is topologically nontrivial, giving rise to a nonzero Berry curvature in the ground magnetic state, leading to the anomalous Hall effect with the在费米级别，电导率高原为$ \ sim $ 1.5 $ e^2/h $。值得注意的是，发现霍尔电导率和磁盘常数很大程度上取决于磁化方向。此外，单层CRBI在可见的和近脉冲光谱范围内显示出极极性kerr效应，最大旋转角度为10 mrad。我们的发现表明，单层CRBI是一种在磁盘和旋转设备中实用应用的有前途的系统。
We present a density functional theory (DFT) based study of a two-dimensional phase of chromium bismuthate (CrBi), previously unknown material with exceptional magnetic and magnetooptical characteristics. Monolayer CrBi is a ferromagnetic metal with strong spin-orbit coupling induced by the heavy bismuth atoms, resulting in a strongly anisotropic Ising-type magnetic ordering with the Curie temperature estimated to be higher than 300 K. The electronic structure of the system is topologically nontrivial, giving rise to a nonzero Berry curvature in the ground magnetic state, leading to the anomalous Hall effect with the conductivity plateau of $\sim$1.5 $e^2/h$ at the Fermi level. Remarkably, the Hall conductivity and the magnetooptical constant are found to be strongly dependent on the direction of magnetization. Besides, monolayer CrBi demonstrates the polar magnetooptical Kerr effect in the visible and near-ultraviolet spectral ranges with the maximum rotation angles of up to 10 mrad. Our findinds suggest that monolayer CrBi is a promising system for practical applications in magnetooptical and spintronic devices.
