论文标题
单层MNB中的应变诱导磁性和淋巴结环
Strain-tunable magnetism and nodal loops in monolayer MnB
论文作者
论文摘要
设计具有磁性和拓扑特性的二维（2D）材料已不断引起人们对基本科学和潜在应用的强烈兴趣。在这里，根据第一原理的计算，我们预测了单层MNB中抗铁磁性和Dirac节点环（NL）的共存，在该MNB中，频带越过的点非常接近费米水平。值得注意的是，中等菌株可以诱导铁磁相转变，从而将单层MNB驱动到带有Weyl NLS的铁磁金属。以前尚未观察到这种类型的拓扑量子相变。此外，研究了两种类型的NLS以及磁临界温度的对称性保护特性。单层MNB中可控的磁性和拓扑顺序为探索拓扑量子相变和实现纳米复杂设备提供了独特的平台。
Designing two-dimensional (2D) materials with magnetic and topological properties has continuously attracted intense interest in fundamental science and potential applications. Here, on the basis of first-principles calculations, we predict the coexistence of antiferromagnetism and Dirac nodal loop (NL) in the monolayer MnB, where the band crossing points are very close to the Fermi Level. Remarkably, a moderate strain can induce an antiferromagnetic to ferromagnetic phase transition, driving the monolayer MnB to a ferromagnetic metal with Weyl NLs. Such a type of topological quantum phase transition has not been observed before. In addition, the symmetry-protected properties of the two types of NLs as well as the magnetic critical temperatures are investigated. The controllable magnetic and topological order in monolayer MnB offers a unique platform for exploring topological quantum phase transitions and realizing nanospintronic devices.
