论文标题
中央四方磁体中的梅隆，天际和涡流晶体
Meron, skyrmion, and vortex crystals in centrosymmetric tetragonal magnets
论文作者
论文摘要
手性磁铁公司中梅隆和Skyrmion拓扑旋转纹理之间的转换的最新实验确认，$ _8 $ Zn $ _9 $ _9 $ MN $ _3 $ [S.-Z. Lin等人，物理。 Rev. B 91，224407（2015）; X. Z. Yu等人，Nature 564，95（2018）]证实，2009年发现的Skyrmion晶体[S. Mühlbauer等人，科学323，915（2009）]只是冰山一角。可以通过将简单的物理成分（例如晶格对称性，挫败感和自旋各向异性）结合来稳定拓扑质地的晶体，包括天空，梅隆，涡旋和单孔的晶体。当前的挑战是找到这些成分的组合，这些成分产生特定的拓扑旋转纹理。在这里，我们报告了一种简单的机制，用于稳定中心对称四方磁体中梅隆，天际和涡流晶体。特别是，即使在没有磁场的情况下，梅隆/天际晶体也可以形成。磁场的应用导致多种拓扑自旋纹理，这些纹理质地在理论的长波长极限中生存。当传导电子耦合到旋转时，这些拓扑自旋纹理会扭曲电子波函数，以诱导Chern绝缘子和Weyl Semimetals，以用于特定的带填充分数。
The recent experimental confirmation of a transformation between meron and skyrmion topological spin textures in the chiral magnet Co$_8$Zn$_9$Mn$_3$ [S.-Z. Lin et al., Phys. Rev. B 91, 224407 (2015); X. Z. Yu et al., Nature 564, 95 (2018)] confirms that the skyrmion crystals discovered in 2009 [S. Mühlbauer et al., Science 323, 915 (2009)] are just the tip of the iceberg. Crystals of topological textures, including skyrmions, merons, vortices, and monopoles, can be stabilized by combining simple physical ingredients, such as lattice symmetry, frustration, and spin anisotropy. The current challenge is to find the combinations of these ingredients that produce specific topological spin textures. Here we report a simple mechanism for the stabilization of meron, skyrmion, and vortex crystals in centrosymmetric tetragonal magnets. In particular, the meron/skyrmion crystals can form even in absence of magnetic field. The application of magnetic field leads to a rich variety of topological spin textures that survive in the long wavelength limit of the theory. When conduction electrons are coupled to the spins, these topological spin textures twist the electronic wave functions to induce Chern insulators and Weyl semimetals for specific band filling fractions.
