Realization of a quadrupole topological insulator phase in a gyromagnetic photonic crystal

Zhou, Peiheng1; Liu, Gui-Geng2; Wang, Zihao2; Li, Shuwei1; Xie, Qindong1; Zhang, Yunpeng1; Mandal, Subhaskar2; Xi, Xiang3; Gao, Zhen4; Deng, Longjiang1; Zhang, Baile2,5

2024-04-01

10.1093/nsr/nwae121

NATIONAL SCIENCE REVIEW   影响因子和分区

2095-5138

2053-714X

["The field of topological photonics was initiated with the realization of a Chern insulator phase in a gyromagnetic photonic crystal (PhC) with broken time-reversal symmetry (T), hosting chiral edge states that are topologically protected propagating modes. Along a separate line of research, a quadrupole topological insulator was the first higher-order topological phase supporting localized corner states, but has been so far limited to T-invariant systems, as T is a key ingredient in early models. Here we report the realization of a quadrupole topological insulator phase in a gyromagnetic PhC, as a consequence of topological phase transition from the previously demonstrated Chern insulator phase. The phase transition has been demonstrated with microwave measurements, which characterize the evolution from propagating chiral edge states to localized corner states. We also demonstrate the migration of topological boundary states into the continuum, when the gyromagnetic PhC is magnetically tuned. These results extend the quadrupole topological insulator phase into T-broken systems, and integrate topologically protected propagating and localized modes in a magnetically tunable photonic crystal platform.","Realization of a quadrupole topological insulator (QTI) phase in a gyromagnetic photonic crystal broadens the realm of QTI phases to encompass time-reversal symmetry-broken systems and holds the potential to integrate topologically protected unidirectional propagating and localized states in a single photonic platform."]

quadrupole topological insulator time-reversal symmetry breaking corner states topological phase transition

SCI

英语

其他

National Natural Science Foundation of China["52022018","52021001"] ; Singapore National Research Foundation Competitive Research Program[NRF-CRP23-2019-0007]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001216226200001

OXFORD UNIV PRESS

Web of Science

1.Univ Elect Sci & Technol China, Natl Engn Res Ctr Electromagnet Radiat Control Mat, Key Lab Multispectral Absorbing Mat & Struct, Minist Educ, Chengdu 611731, Peoples R China
2.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore
3.Dongguan Univ Technol, Sch Elect Engn & Intelligentizat, Dongguan 523808, Peoples R China
4.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
5.Nanyang Technol Univ, Photon Inst, Ctr Disrupt Photon Technol, Singapore 639798, Singapore

Zhou, Peiheng,Liu, Gui-Geng,Wang, Zihao,et al. Realization of a quadrupole topological insulator phase in a gyromagnetic photonic crystal[J]. NATIONAL SCIENCE REVIEW,2024.

Zhou, Peiheng.,Liu, Gui-Geng.,Wang, Zihao.,Li, Shuwei.,Xie, Qindong.,...&Zhang, Baile.(2024).Realization of a quadrupole topological insulator phase in a gyromagnetic photonic crystal.NATIONAL SCIENCE REVIEW.

Zhou, Peiheng,et al."Realization of a quadrupole topological insulator phase in a gyromagnetic photonic crystal".NATIONAL SCIENCE REVIEW (2024).