非厄米特光子连续统中的非常规外尔例外轮廓
Unconventional Weyl exceptional contours in non-Hermitian photonic continua
摘要：
拓扑荷大于1的非常规外尔点在非厄米特扰动下可以变换为各种复杂的非常规外尔例外轮廓。然而，这些特殊的轮廓的理论研究一直局限于紧束缚模型。在这里，我们提出了实现非传统的外尔例外轮廓的光子连续-非厄米各向异性手征等离子体，基于麦克斯韦方程组的从头计算。通过扰动面内介电常数，非常规外尔点可以变换为二次外尔例外圆、单链点的I型外尔例外链、双链点的II型外尔例外链等形式.提出了具有有效本构参数的现实超材料来实现这些非常规的外尔例外轮廓。我们的工作为探索非厄米拓扑光子连续统中非常规外尔异常轮廓的奇异物理铺平了道路。
英文摘要：
Unconventional Weyl points with topological charges higher than 1 can transform into various complex unconventional Weyl exceptional contours under non-Hermitian perturbations. However, theoretical studies of these exceptional contours have been limited to tight-binding models. Here, we propose to realize unconventional Weyl exceptional contours in photonic continua -- non-Hermitian anisotropic chiral plasma, based on ab initio calculation by Maxwell's equations. By perturbing in-plane permittivity, an unconventional Weyl point can transform into a quadratic Weyl exceptional circle, a Type-I Weyl exceptional chain with one chain point, a Type-II Weyl exceptional chain with two chain points, or other forms. Realistic metamaterials with effective constitutive parameters are proposed to implement these unconventional Weyl exceptional contours. Our work paves a way toward exploration of exotic physics of unconventional Weyl exceptional contours in non-Hermitian topological photonic continua.
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