论文标题
证明光子晶体中非亚伯框架电荷流
Demonstration of non-Abelian frame charge flow in photonic crystals
论文作者
论文摘要
在PT对称系统中,非亚伯框架的概念通过检查特征向量框架旋转来使退化节点的多型拓扑表征。有趣的是,这些框架电荷的某些功能可以看作是限制在导电中的电荷的类似物,只是它们沿着节点线在动量空间中流动。但是,这些框架电荷不是整数,并且在相邻带节点线之间的编织时出现了非亚洲签名,从而将流动的方向翻转。在光子系统中,我们发现光子γ点是由于在零频率下经常被命令的静电模式引起的隐藏编织而引起的此类框架电荷流的源或水槽。我们使用双轴光子晶体作为示例,并说明如何将复杂的节点线构型解释为从γ点到布里鲁因区域边界的框架电荷流的拓扑后果。我们进一步设计和制造的元结晶,以实验观察这些线节点是非亚伯框架电荷流的表现。
In PT symmetric systems, the notion of non-Abelian frame charges enables multiband topological characterization of the degeneracy nodes through examining the eigenvector frame rotations. Interestingly, some features of these frame charges can be viewed as an analogue of electric charges confined in conducting wires, only that they flow in momentum space along nodal lines. However, these frame charges are not integers, and non-Abelian signatures emerge when braiding between adjacent band nodal lines occurs, which flips the direction of the flow. In photonic systems, we discover that the photonic Γ point serves as the source or sink of such frame charge flow due to a hidden braiding induced by the often-ignored electrostatic mode at zero-frequency. We use biaxial photonic crystals as examples and show how complex nodal line configurations can be explained as the topological consequences of the frame charge flow from the Γ point to the Brillouin zone boundaries. We further designed and fabricated meta-crystals to experimentally observe these line nodes as manifestation of the non-Abelian frame charge flow.