Meron, skyrmion, and vortex crystals in centrosymmetric tetragonal magnets
Meron, skyrmion, and vortex crystals in centrosymmetric tetragonal magnets
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DOI：
10.1103/physrevb.103.104408
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发表时间：
2020-11
影响因子：
3.7
通讯作者：
Zhentao Wang;Ying Su;Shizeng Lin;C. Batista
中科院分区：
文献类型：
--
作者：
Zhentao Wang;Ying Su;Shizeng Lin;C. Batista
最近的实验证实了手征磁体${\mathrm{Co}}_{8}{\mathrm{Zn}}_{9}{\mathrm{Mn}}_{3}$ [S.- Z. Lin等人，Phys. Rev. B 91，224407（2015）; X. Z. Yu等人，Nature 564，95（2018）]证实了2009年发现的skyrmion晶体[S. M uhlbauer等人，Science 323，915（2009）]只是冰山一角。拓扑结构的晶体，包括skyrmions，merons，vortices和monopole，可以通过组合简单的物理成分来稳定，如晶格对称性，挫折和自旋各向异性。目前的挑战是找到这些成分的组合，产生特定的拓扑自旋纹理。在这里，我们报告了一个简单的机制，稳定的meron，skyrmion，和涡旋晶体中心对称的tetraquartz磁铁。特别是，meron/skyrmion晶体甚至可以在没有磁场的情况下形成。磁场的应用导致了丰富多样的拓扑自旋织构，这些织构在理论的长波长极限下仍然存在。当传导电子耦合到自旋时，这些拓扑自旋纹理扭曲电子波函数，以诱导Chern绝缘体和Weyl半金属的特定带填充分数。
The recent experimental confirmation of a transformation between meron and skyrmion topological spin textures in the chiral magnet ${\mathrm{Co}}_{8}{\mathrm{Zn}}_{9}{\mathrm{Mn}}_{3}$ [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. M\"uhlbauer 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.