AI 中文总结
研究磁外尔半金属中的涌现电磁响应，通过有效双带模型推导磁电响应公式，包括带内和带间贡献，应用于极性外尔铁磁体模型，揭示环形矩动力学与涌现感应响应的关系及外尔半金属拓扑性质对电磁响应的影响。
AI 中文摘要
我们从理论上研究了外尔半金属中的涌现电磁响应。聚焦于磁外尔半金属，我们发展了一种由磁动力学驱动的涌现感应的一般理论。我们表明外尔半金属中的磁电响应会引发由磁化动力学介导的涌现感应。利用磁外尔半金属的有效双带模型，我们推导出了一个包含带内和带间贡献的磁电响应公式。所得公式表明带内贡献与弛豫时间τ成正比，而带间贡献与外尔节点的分离有关。将该一般公式应用于极性外尔铁磁体模型，我们证明了环形矩的动力学与极性外尔铁磁体中最近由铃木等人发现的涌现感应响应密切相关。电感的化学势依赖性表明，在能量范围内，外尔色散中的涌现电磁响应得到增强，这反映了外尔半金属的拓扑性质。
英文摘要
We theoretically study emergent electromagnetic responses in Weyl semimetals. Focusing on magnetic Weyl semimetals, we develop a general theory of emergent induction driven by magnetic dynamics. We show that magnetoelectric (ME) responses in Weyl semimetals give rise to emergent induction mediated by magnetization dynamics. Using effective two-band models for magnetic Weyl semimetals, we derive a formula for the ME response that includes both intraband and interband contributions. The resulting formula shows that the intraband contribution is proportional to the relaxation time $τ$, whereas the interband contribution is associated with the separation of the Weyl nodes. Applying the general formula to a model of polar Weyl ferromagnets, we demonstrate that the dynamics of the toroidal moment is closely related to the emergent inductive response in polar Weyl ferromagnets, as recently discovered by Suzuki et al. [Y. Suzuki et al. arXiv:2607.12322]. The chemical-potential dependence of the inductance indicates that the emergent electromagnetic response is enhanced in the energy range of the Weyl dispersion, reflecting the topological nature of Weyl semimetals.
Comments8 pages, 3 figures
