四重-Q磁性刺猬晶格中的集体激发理论
Theory of collective excitations in the quadruple-$Q$ magnetic hedgehog lattices
AI总结：
本文利用三维Kondo-lattice模型研究了磁性刺猬晶格的集体自旋波激发，发现亚太赫兹模式局域于Dirac弦并呈现平移振荡，其光谱特征可识别与单极子对湮灭相关的拓扑相变。
摘要：
磁体中的刺猬和反刺猬自旋纹理表现为涌现的单极子和反单极子，引发了惊人的输运和电磁现象。利用三维Kondo-lattice模型，我们从理论上研究了最近在巡游磁体（如MnSi1-xGex和SrFeO3）中发现的磁性刺猬晶格的集体自旋波激发模式。研究表明，出现在亚太赫兹频段的自旋波模式，其主要振幅局域于连接刺猬-反刺猬对的Dirac弦上，并以平移振荡为特征。研究发现，其光谱特征敏感地依赖于Dirac弦的数量和配置，因此可用于识别与单极子-反单极子对湮灭相关的拓扑相变。
英文摘要：
Hedgehog and antihedgehog spin textures in magnets behave as emergent monopoles and antimonopoles, which give rise to astonishing transport and electromagnetic phenomena. Using the Kondo-lattice model in three dimensions, we theoretically study collective spin-wave excitation modes of magnetic hedgehog lattices which have recently been discovered in itinerant magnets such as MnSi1-xGex and SrFeO3. It is revealed that the spin-wave modes, which appear in the sub-terahertz regime, have dominant amplitudes localized at Dirac strings connecting hedgehog-antihedgehog pairs and are characterized by their translational oscillations. It is found that their spectral features sensitively depend on the number and configuration of the Dirac strings and, thus, can be exploited for identifying the topological phase transitions associated with the monopole-antimonopole pair annihilations.
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