异向介质拓扑转变的有效介质观
Effective Medium Perspective on Topological Transitions in Metamaterials
摘要：
光子结构的许多性质依赖于带拓扑，其特征在于整数不变量可以在拓扑转变期间改变，并产生无序鲁棒的拓扑边、角或界面状态。通常，这种结构的周期与波长相当。然而，在许多情况下，单位单元变得深亚波长，因此整个超材料可以用有效材料参数来描述。在这里，专注于亚波长拓扑超材料，我们确定的行为的介电常数和磁导率伴随的拓扑结构的例子具有$D_6$对称性的转变。
英文摘要：
Many properties of photonic structures rely on band topology characterized by the integer invariants that can change during the topological transitions and give rise to the disorder-robust topological edge, corner, or interface states. Typically the periods of such structures are comparable to the wavelength. However, in many cases, the unit cell becomes deeply subwavelength and hence the entire metamaterial can be described in terms of the effective material parameters. Here, focusing on subwavelength topological metamaterials, we identify the behavior of permittivity and permeability accompanying the topological transition on the example of the two structures possessing $D_6$ symmetry.
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