论文标题
铁磁性Mn $ _3 $ ga中的Weyl节点的非连线磁调制
Noncollinear Magnetic Modulation of Weyl Nodes in Ferrimagnetic Mn$_3$Ga
论文作者
论文摘要
四方铁磁Mn $ _3 $ ga具有广泛的吸引人的磁性。在这里，我们报告了在没有旋转轨道耦合（SOC）的情况下拓扑非平凡的淋巴结线的出现，这些耦合（SOC）受镜像和$ c_ {4z} $旋转对称性的保护。在SOC的存在下，我们证明了双重的非平凡交叉点演变为$ c_ {4z} $ - 受$ \ pm $ $ $ 2的手性收费的受保护的Weyl节点。此外，我们已经考虑了实验报告的非胶合性铁磁结构，其中Mn $ _i $ Atom的磁矩（在MN-GA平面上）被角度$θ$相对于晶体学$ C $ c $ c $轴倾斜。 $θ$的Weyl节点的演变表明，双Weyl节点分为一对电荷-1 Weyl节点，它们的分离可以通过非共线性铁磁结构中的磁取向调节。
The tetragonal ferrimagnetic Mn$_3$Ga exhibits a wide range of intriguing magnetic properties. Here, we report the emergence of topologically nontrivial nodal lines in the absence of spin orbit coupling (SOC) which are protected by both mirror and $C_{4z}$ rotational symmetries. In the presence of SOC we demonstrate that the doubly degenerate nontrivial crossing points evolve into $C_{4z}$-protected Weyl nodes with chiral charge of $\pm$2. Furthermore, we have considered the experimentally reported noncollinear ferrimagnetic structure, where the magnetic moment of the Mn$_I$ atom (on the Mn-Ga plane) is tilted by an angle $θ$ with respect to the crystallographic $c$ axis. The evolution of the Weyl nodes with $θ$ reveals that the double Weyl nodes split into a pair of charge-1 Weyl nodes whose separation can be tuned by the magnetic orientation in the noncollinear ferrimagnetic structure.
