Localization of Chiral Edge States by the Non-Hermitian Skin Effect

Liu, Gui-Geng1; Mandal, Subhaskar1; Zhou, Peiheng2; Xi, Xiang3; Banerjee, Rimi1; Hu, Yuan -Hang2; Wei, Minggui1; Wang, Maoren2; Wang, Qiang4; Gao, Zhen5; Chen, Hongsheng6; Yang, Yihao6; Chong, Yidong1,7; Zhang, Baile1,7

2024-03-12

10.1103/PhysRevLett.132.113802

PHYSICAL REVIEW LETTERS   影响因子和分区

0031-9007

1079-7114

Quantum Hall systems host chiral edge states extending along the one-dimensional boundary of any two-dimensional sample. In solid state materials, the edge states serve as perfectly robust transport channels that produce a quantized Hall conductance; due to their chirality, and the topological protection by the Chern number of the bulk band structure, they cannot be spatially localized by defects or disorder. Here, we show experimentally that the chiral edge states of a lossy quantum Hall system can be localized. In a gyromagnetic photonic crystal exhibiting the quantum Hall topological phase, an appropriately structured loss configuration imparts the edge states' complex energy spectrum with a feature known as point -gap winding. This intrinsically non -Hermitian topological invariant is distinct from the Chern number invariant of the bulk (which remains intact) and induces mode localization via the "non -Hermitian skin effect." The interplay of the two topological phenomena-the Chern number and point -gap winding-gives rise to a non -Hermitian generalization of the paradigmatic Chern-type bulk -boundary correspondence principle. Compared to previous realizations of the non -Hermitian skin effect, the skin modes in this system have superior robustness against local defects and disorders.

SCI ; EI

英语

其他

National Natural Science Foundation of China (NSFC)["52021001","2022YFA1405200"] ; Key Research and Development Program of the Ministry of Science and Technology["2022YFA1404704","2022YFA1404900","11961141010"] ; National Natural Science Foundation of China (NNSFC)["62175215","61975176","2021FZZX001-19"] ; Fundamental Research Funds for the Central Universities[62375118] ; National Natural Science Foundation of China["6231101016","12104211","NRF-CRP23-2019-0007"] ; null[52022018]

Physics

Physics, Multidisciplinary

WOS:001198639000011

AMER PHYSICAL SOC

PHYSICS

Web of Science

1.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, 21 Nanyang Link, Singapore 637371, Singapore
2.Univ Elect Sci & Technol China, Natl Engn Res Ctr Electromagnet Radiat Control Mat, State Key Lab Elect Thin Film & Integrated Devices, Chengdu 610054, Peoples R China
3.Dongguan Univ Technol, Sch Elect Engn & Intelligentizat, Dongguan 523808, Peoples R China
4.Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China
5.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
6.Zhejiang Univ, ZJU UIUC Inst, Coll Informat Sci & Elect Engn, Interdisciplinary Ctr Quantum Informat,ZJU Hangzho, Hangzhou 310027, Peoples R China
7.Nanyang Technol Univ, Photon Inst, Ctr Disrupt Photon Technol, 50 Nanyang Ave, Singapore 639798, Singapore

Liu, Gui-Geng,Mandal, Subhaskar,Zhou, Peiheng,et al. Localization of Chiral Edge States by the Non-Hermitian Skin Effect[J]. PHYSICAL REVIEW LETTERS,2024,132(11).

Liu, Gui-Geng.,Mandal, Subhaskar.,Zhou, Peiheng.,Xi, Xiang.,Banerjee, Rimi.,...&Zhang, Baile.(2024).Localization of Chiral Edge States by the Non-Hermitian Skin Effect.PHYSICAL REVIEW LETTERS,132(11).

Liu, Gui-Geng,et al."Localization of Chiral Edge States by the Non-Hermitian Skin Effect".PHYSICAL REVIEW LETTERS 132.11(2024).