Ideal Photonic Weyl Nodes Stabilized by Screw Rotation Symmetry in Space Group 19
Ideal Photonic Weyl Nodes Stabilized by Screw Rotation Symmetry in Space Group 19
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DOI：
10.3390/cryst10070605
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发表时间：
2020-07
期刊：
影响因子：
--
通讯作者：
Wenlong Gao;Yao-Ting Wang
中科院分区：
文献类型：
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作者：
Wenlong Gao;Yao-Ting Wang
自从在电子的凝聚态物理中发现了拓扑绝缘体之后，拓扑光子学在最近几年得到了发展。在众多的研究中，光子Weyl节点由于其有趣的表面费米弧、手征零模和散射特性，最近被研究得很多。在这篇文章中，我们提出了一种理想的光子Weyl结点准晶体的新设计，这意味着在Weyl结点的频率上不存在过多的态。空间群19的螺旋旋转对称性稳定了Weyl结点。利用群论分析揭示了61空间群较高对称性的超晶格中线结点是如何孕育而来的。发现了时间反转不变系统的最小四个Weyl结点的复形，这是一种与标准印刷电路板工艺兼容的现实光子Weyl结点元晶体设计，是对现有少数理想光子Weyl结点设计的补充，可进一步用于Weyl物理的研究，如手征零模和散射。
Topological photonics have developed in recent years since the seminal discoveries of topological insulators in condensed matter physics for electrons. Among the numerous studies, photonic Weyl nodes have been studied very recently due to their intriguing surface Fermi arcs, Chiral zero modes and scattering properties. In this article, we propose a new design of an ideal photonic Weyl node metacrystal, meaning no excessive states are present at the Weyl nodes’ frequency. The Weyl node is stabilized by the screw rotation symmetry of space group 19. Group theory analysis is utilized to reveal how the Weyl nodes are spawned from line nodes in a higher symmetry metacrystal of space group 61. The minimum four Weyl nodes’ complex for time reversal invariant systems is found, which is a realistic photonic Weyl node metacrystal design compatible with standard printed circuit board techniques and is a complement to the few existing ideal photonic Weyl node designs and could be further utilized in studies of Weyl physics, for instance, Chiral zero modes and scatterings.