Topological edge and corner states in biphenylene photonic crystal

被引：5

作者：

Phan, Huyen thanh ^{[1
]}

Koizumi, Keiki ^{[1
]}

Liu, Feng ^{[2
,3
]}

Wakabayashi, Katsunori ^{[1
,4
,5
]}

机构：

[1] Kwansei Gakuin Univ, Sch Sci & Technol, Dept Nanotechnol Sustainable Energy, 1 Gakuen Uegahara, Sanda, Hyogo 6691330, Japan

[2] Ningbo Univ, Sch Phys Sci & Technol, Ningbo 315211, Peoples R China

[3] Ningbo Univ, Inst High Pressure Phys, Ningbo 315211, Peoples R China

[4] Osaka Univ, Ctr Spintron Res Network CSRN, Toyonaka 5608531, Japan

[5] Natl Inst Mat Sci NIMS, Tsukuba, Ibaraki 3050044, Japan

来源：

OPTICS EXPRESS | 2024年 / 32卷 / 02期

基金：

日本学术振兴会;

关键词：

INSULATOR; PHASE;

D O I：

10.1364/OE.510595

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The biphenylene network (BPN) has a unique two-dimensional atomic structure, where hexagonal unit cells are arranged on a square lattice. Inspired by such a BPN structure, we design a counterpart in the fashion of photonic crystals (PhCs), which we refer to as the BPN PhC. We study the photonic band structure using the finite element method and characterize the topological properties of the BPN PhC through the use of the Wilson loop. Our findings reveal the emergence of topological edge states in the BPN PhC, specifically in the zigzag edge and the chiral edge, as a consequence of the nontrivial Zak phase in the corresponding directions. In addition, we find the localization of electromagnetic waves at the corners formed by the chiral edges, which can be considered as second-order topological states, i.e., topological corner states.

引用

页码：2223 / 2234

页数：12

共 56 条

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