论文标题
磁动力学用韦尔福物
Magnetic dynamics with Weyl fermions
论文作者
论文摘要
在非平衡热力学的框架中研究了电荷和山谷自由度的运输，并在磁性Weyl半法中耦合到有序参数动力学。除了植根于谱带拓扑结构的已建立的与山谷相关的转运异常外，我们还通过电磁扰动驱动的系统的三个动态成分之间构建了耗散耦合。我们展示了山谷的自由度如何通过手性异常的组合，电动侧以及磁性侧的Onsager Paired Valley扭矩和泵送。这项工作通过对集体耗散进行更系统的分析来补充磁性Weyl半学的研究。我们讨论了山谷介导的电流磁性磁不稳定性和电荷泵送的几个具体示例，并将理论扩展到抗磁磁病例。
Transport of charge and valley degrees of freedom coupled to order-parameter dynamics in magnetic Weyl semimetals is studied in the framework of nonequilibrium thermodynamics. In addition to the established valley-related transport anomalies that are rooted in band-structure topology, we construct dissipative couplings between the three dynamic constituents of the system driven out of equilibrium by electromagnetic perturbations. We show how the valley degree of freedom mediates an effective coupling between the charge and magnetic sectors of the system, through a combination of the chiral anomaly, on the electric side, and the Onsager-paired valley torque and pumping, on the magnetic side. This work compliments previous studies of magnetic Weyl semimetals by a more systematic analysis of collective dissipation. We discuss several concrete examples of the valley-mediated current-driven magnetic instabilities and charge pumping, and extend the theory to the antiferromagnetic case.
