非共线反铁磁体中自旋波的模拟：自旋翻转态，自旋螺旋，skyrmions和antiskyrmions
Modelling spin waves in noncollinear antiferromagnets: spin-flop states, spin spirals, skyrmions and antiskyrmions
摘要：
反铁磁材料中的自旋波在下一代磁振子技术中具有巨大的潜力。然而，它们的性质及其对基态反铁磁结构类型的依赖性仍然是一个悬而未决的问题。在这里，我们研究理论上的自旋波在一维和二维模型系统的重点是非共线反铁磁纹理，如自旋螺旋和相反的拓扑电荷skyrmions。我们特别解决了最近在体反铁磁体$α$ -$\text{Cu}_2\text{V}_2\text{O}_7$中利用非弹性中子散射实验测量的非互易自旋激发[Phys.\修订版本\ Lett. \textbf{119}，047201（2017）]，其中我们帮助表征检测到的自旋波模式的性质。此外，我们讨论了Dzyaloshinskiii-Moriya相互作用如何提高反铁磁物质中自旋波模式的简并度，类似于电子Rashba分裂。本文研究了反铁磁自旋螺旋系统和Skyrmion系统中的自旋波激发，讨论了它们的非弹性散射谱特征。我们证明了在某些反铁磁体中，可以用各向同性的Dzyaloshinskiii-Moriya相互作用获得反克尔米离子。
英文摘要：
Spin waves in antiferromagnetic materials have great potential for next-generation magnonic technologies. However, their properties and their dependence on the type of ground-state antiferromagnetic structure are still open questions. Here, we investigate theoretically spin waves in one- and two-dimensional model systems with a focus on noncollinear antiferromagnetic textures such as spin spirals and skyrmions of opposite topological charges. We address in particular the nonreciprocal spin excitations recently measured in bulk antiferromagnet $α$--$\text{Cu}_2\text{V}_2\text{O}_7$ utilizing inelastic neutron scattering experiments [Phys.\ Rev.\ Lett.\ \textbf{119}, 047201 (2017)], where we help to characterize the nature of the detected spin-wave modes. Furthermore, we discuss how the Dzyaloshinskii-Moriya interaction can lift the degeneracy of the spin-wave modes in antiferromagnets, resembling the electronic Rashba splitting. We consider the spin-wave excitations in antiferromagnetic spin-spiral and skyrmion systems and discuss the features of their inelastic scattering spectra. We demonstrate that antiskyrmions can be obtained with an isotropic Dzyaloshinskii-Moriya interaction in certain antiferromagnets.
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