Topological and hyperbolic dielectric materials from chirality-induced charge-parity symmetry
Topological and hyperbolic dielectric materials from chirality-induced charge-parity symmetry
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DOI：
10.1103/physreva.104.043510
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发表时间：
2021-10
影响因子：
2.9
通讯作者：
Junpeng Hou;Zhitong Li;Q. Gu;Chuanwei Zhang
中科院分区：
文献类型：
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作者：
Junpeng Hou;Zhitong Li;Q. Gu;Chuanwei Zhang
奇偶时间（PT）对称性，最初是为非厄米开放量子系统设想的，已经为光的相干控制开辟了一条令人兴奋的重要应用途径。本文提出了一种基于电荷-宇称（CP）对称的非厄米光子模式，其中电荷共轭和宇称对称分别被打破，但共同被保留。这种对称性破缺方案诱导了手性介质中介电色散向双曲色散的转变，从而产生了无损的全介电双曲超材料。更有趣的是，CP -对称相变代表了在无限能量下发生的非厄米拓扑相变，并且不需要明确的带隙闭合。我们进一步展示了CP对称光子学的广泛应用，如全角偏振相关的分束器和增强的自发发射。CP对称性为非厄米拓扑光子学开辟了一条未被探索的途径，将新的物理学引入强手性超材料中，因此为光子学和其他相关领域的许多有前途的应用提供了强有力的工具。
Parity-time ( PT ) symmetry, originally conceived for non-Hermitian open quantum systems, has opened an exciting avenue towards coherent control of light for significant applications. Here we propose a paradigm towards non-Hermitian photonics based on the charge-parity ( CP ) symmetry, in which the charge conjugation and parity symmetries are broken individually but preserved jointly. Such a symmetry-breaking scheme induces a transition from dielectric to hyperbolic dispersions in chiral dielectrics, leading to lossless all-dielectric hyperbolic metamaterials. More interestingly, the CP -symmetry transition represents a non-Hermitian topological phase transition that occurs at infinite energy and requires no explicit band gap closing. We further showcase broad applications of CP -symmetric photonics such as an all-angle polarization-dependent beam splitter and enhanced spontaneous emission. The CP symmetry opens an unexplored pathway for non-Hermitian topological photonics by bringing new physics into strong chiral metamaterials, therefore providing a powerful tool for engineering many promising applications in photonics and other related fields.