Topological photonic crystals with zero Berry curvature
Topological photonic crystals with zero Berry curvature
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DOI：
10.1103/physrevb.97.035442
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发表时间：
2018-01-31
影响因子：
3.7
通讯作者：
Wakabayashi, Katsunori
中科院分区：
文献类型：
--
作者：
Liu, Feng;Deng, Hai-Yao;Wakabayashi, Katsunori
拓扑光子晶体是基于扎克相的概念设计的，而不是基于陈数和自旋陈数等拓扑不变量的概念，后者依赖于不为零的贝里曲率的存在。我们的光子晶体 (PC) 由纯电介质制成，位于遵守 C-4v 点群对称性的方形晶格上。考虑了两种类型的个人电脑：一种与电子二维 Su-Schrieffer-Heeger 模型非常相似，另一种则继续作为这种类比的延伸。在这两种情况下，拓扑转变都是通过调整晶格常数引起的。结果表明，拓扑边缘模式 (TEM) 存在于这些 PC 终端上的重要光子带隙内。有限元方法已经证明了这些 TEM 传输电磁能以对抗多种疾病的高效率。
Topological photonic crystals are designed based on the concept of Zak's phase rather than the topological invariants such as the Chern number and spin Chern number, which rely on the existence of a nonvanishing Berry curvature. Our photonic crystals (PCs) are made of pure dielectrics and sit on a square lattice obeying the C-4v point-group symmetry. Two varieties of PCs are considered: one closely resembles the electronic two-dimensional Su-Schrieffer-Heeger model, and the other continues as an extension of this analogy. In both cases, the topological transitions are induced by adjusting the lattice constants. Topological edge modes (TEMs) are shownto existwithin the nontrivial photonic band gaps on the termination of those PCs. The high efficiency of these TEMs transferring electromagnetic energy against several types of disorders has been demonstrated using the finite-element method.