论文标题
中心对称立方金属中的磁性刺猬晶格
Magnetic Hedgehog Lattice in a Centrosymmetric Cubic Metal
论文作者
论文摘要
刺猬晶格（HL）是一种三维拓扑旋转质地，容纳了周期性的磁性单翼和抗巨孔阵列。在理论上，它已经针对具有dzyaloshinskii-moriya相互作用的非中心对称系统进行了研究，但是在中心对称情况下，稳定性以及磁性和拓扑特性仍然难以捉摸。我们在这里通过模拟退火研究了有效的自旋模型的远程双线性和二级相互作用的有效自旋模型的基态。我们表明，我们的模型稳定了由两对左手和右螺旋组成的HL，与非中心对称情况形成鲜明对比，因此没有净标量旋转手性。我们发现，HL在应用磁场中变成了拓扑的锥形状态。从组成旋转螺旋的详细分析中，我们澄清了螺旋平面的椭圆形和角度在增加磁场的同时逐渐变化。我们讨论了与中心物质金属SRFEO $ _3 $的实验相比的结果。
The hedgehog lattice (HL) is a three-dimensional topological spin texture hosting a periodic array of magnetic monopoles and antimonopoles. It has been studied theoretically for noncentrosymmetric systems with the Dzyaloshinskii-Moriya interaction, but the stability, as well as the magnetic and topological properties, remains elusive in the centrosymmetric case. We here investigate the ground state of an effective spin model with long-range bilinear and biquadratic interactions for a centrosymmetric cubic metal by simulated annealing. We show that our model stabilizes a HL composed of two pairs of left- and right-handed helices, resulting in no net scalar spin chirality, in stark contrast to the noncentrosymmetric case. We find that the HL turns into topologically-trivial conical states in an applied magnetic field. From the detailed analyses of the constituent spin helices, we clarify that the ellipticity and angles of the helical planes change gradually while increasing the magnetic field. We discuss the results in comparison with the experiments for a centrosymmetric cubic metal SrFeO$_3$.
