论文标题
有效的材料搜索室温拓扑元音
An efficient material search for room temperature topological magnons
论文作者
论文摘要
受拓扑保护的木片表面状态是高度可取的，是设计低衰减旋转器设备的理想平台。然而，在强相关材料中对拓扑镁的理论预测被证明是具有挑战性的，因为从头算密度的功能理论计算无法可靠地预测相关材料中的磁相互作用。在这里，我们提出了一种基于对称性的方法，该方法在应用外部扰动（例如磁/电场和/或机械菌株）时，可以预测磁性有序晶体中的拓扑元音。我们采用这种方法来进行有效的磁料搜索，以在毕尔巴鄂晶体学服务器中进行磁性材料，在198种超过300 k过渡温度的化合物中，我们确定了12个支持室温的磁性绝缘子，这些磁性绝缘子支持室温拓扑元音。它们具有带有手性表面或铰链磁化模式的表面镁弧和镁轴绝缘子的Weyl木元素，提供了一种基于受保护的表面磁子实现节能设备的途径。
Topologically protected magnon surface states are highly desirable as an ideal platform to engineer low-dissipation spintronics devices. However, theoretical prediction of topological magnons in strongly correlated materials proves to be challenging because the ab initio density functional theory calculations fail to reliably predict magnetic interactions in correlated materials. Here, we present a symmetry-based approach, which predicts topological magnons in magnetically ordered crystals, upon applying external perturbations such as magnetic/electric fields and/or mechanical strains. We apply this approach to carry out an efficient search for magnetic materials in the Bilbao Crystallographic Server, where, among 198 compounds with an over 300-K transition temperature, we identify 12 magnetic insulators that support room-temperature topological magnons. They feature Weyl magnons with surface magnon arcs and magnon axion insulators with either chiral surface or hinge magnon modes, offering a route to realize energy-efficient devices based on protected surface magnons.
