论文标题
范德华磁铁CRI3中的磁性理论
Theory of magnetism in the van der Waals magnet CrI3
论文作者
论文摘要
我们研究了范德华磁铁CRI3中各向异性铁磁学的微观起源。我们得出的结论是，最近的邻居交换是由海森伯格 - 凯塔夫 - 伽马（HKGAMMA）模型很好地描述的，我们还发现了下一个最近的邻居的非零dzyaloshinskii-moriya互动（DMI）。众所周知，Kitaev和DMI都会在蜂窝晶状体中产生镁的非平凡拓扑，并已分别用于描述该材料的低能状态。我们讨论的是，包括一个或另一个导致Chern号码的不同迹象。此外，尽管K-Point的拓扑间隙似乎主要由DMI产生，尽管它比Kitaev小。最后，我们表明，通过施加垂直于晶体平面的外部电场，可以在最近的邻居上诱导DMI，这可能会在非共线自旋纹理（例如域壁和天空般）中产生后果。
We study the microscopical origin of anisotropic ferromagnetism in the van der Waals magnet CrI3. We conclude that the nearest neighbors exchange is well described by the Heisenberg-Kitaev-Gamma (HKGamma) model, and we also found a nonzero Dzyaloshinskii-Moriya interaction (DMI) on next nearest neighbors. Both Kitaev and DMI are known to generate a non-trivial topology of the magnons in the honeycomb lattice and have been used separately to describe the low energy regime of this material. We discuss that including one or the other leads to different signs of the Chern number. Furthermore, the topological gap at K-point seems to be mainly produced by DMI, despite it is one order of magnitude smaller than Kitaev. Finally, we show that by applying an external electric field perpendicular to the crystal plane, it is possible to induce DMI on nearest neighbors, and this could have consequences in non-collinear spin textures, such as domain walls and skyrmions.
