论文标题
旋转时空调制：拓扑阶段和时空haldane模型
Rotating Spacetime Modulation: Topological Phases and Spacetime Haldane Model
论文作者
论文摘要
拓扑光子学最近已成为一个非常通用的框架，用于设计对后散射和变形的单向边缘波导，以及具有极端非互联性波现象的其他平台。虽然文献中广泛讨论了时间不变晶体的拓扑分类，但对时变材料形成的时空晶体的研究仍然在很大程度上没有探索。在这里，我们将拓扑结构理论的方法扩展到光子晶体，该光子晶体由夹杂物形成，这些晶体受到时空旋转波调制的影响，该调制模仿了物理旋转运动。通过诉诸于夹杂物的电磁反应的近似非均匀有效描述，可以表明它们具有双异常反应，破坏了时间反转的对称性，并可能引起非平凡的拓扑结构。特别是，我们建议在时空调制光子晶体中实现Haldane模型。
Topological photonics has recently emerged as a very general framework for the design of unidirectional edge waveguides immune to back-scattering and deformations, as well as other platforms that feature extreme nonreciprocal wave phenomena. While the topological classification of time invariant crystals has been widely discussed in the literature, the study of spacetime crystals formed by time-variant materials remains largely unexplored. Here, we extend the methods of topological band theory to photonic crystals formed by inclusions that are subject to a spacetime rotating-wave modulation that imitates a physical rotating motion. By resorting to an approximate nonhomogeneous effective description of the electromagnetic response of the inclusions, it is shown that they possess a bianisotropic response that breaks the time-reversal symmetry and may give rise to non-trivial topologies. In particular, we propose an implementation of the Haldane model in a spacetime modulated photonic crystal.
