Non-Hermitian second-order topology induced by resistances in electric circuits

Jien Wu, Xueqin Huang, Yating Yang, Weiyin Deng, Jiuyang Lu, Wenji Deng, and Zhengyou Liu
Phys. Rev. B 105, 195127 – Published 20 May 2022

Abstract

The study of topological states in electric circuits is developing rapidly recently and forming the field of topoelectrical circuits. As both the loss and gain can be easily introduced and tuned in electric circuits, it permits flexible and accurate fabrications of non-Hermitian systems. Loss is generally considered negative in electric circuits, as it weakens the electrical signals. However, we show here that a non-Hermitian second-order topological phase can be realized in electric circuits by taking advantage of loss. We observe the gapped edge states and in-gap corner states in experiment. Our system provides a readily accessible platform to explore the non-Hermitian-induced topological phases.

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  • Received 10 March 2022
  • Accepted 11 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.195127

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jien Wu1,*, Xueqin Huang1,*, Yating Yang1, Weiyin Deng1,†, Jiuyang Lu1,‡, Wenji Deng1, and Zhengyou Liu2,3,§

  • 1School of Physics and Optoelectronics and State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China
  • 2Key Laboratory of Artificial Micro- and Nanostructures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, China
  • 3Institute for Advanced Studies, Wuhan University, Wuhan 430072, China

  • *These authors contributed equally to this work.
  • Corresponding author: dengwy@scut.edu.cn
  • Corresponding author: phjylu@scut.edu.cn
  • §Corresponding author: zyliu@whu.edu.cn

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Issue

Vol. 105, Iss. 19 — 15 May 2022

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