Observation of corner states in second-order topological electric circuits

Jien Wu, Xueqin Huang, Jiuyang Lu, Ying Wu, Weiyin Deng, Feng Li, and Zhengyou Liu
Phys. Rev. B 102, 104109 – Published 22 September 2020

Abstract

Recently, the topological states in electric circuits have attracted a great deal of attention, and they have formed the basis of the field of so-called topoelectrical circuits. We realize a second-order topological electric circuit with capacitors and inductors, and we observe the corner states that exist in the bulk gap, the continuum of bulk modes, and the dependence on the corner shapes by measuring the resonance peaks of the corner impedance. More importantly, we broaden the second-order topological circuit to the non-Hermitian region by adding resistors. Interestingly, the non-Hermiticity tunes the amplitude of the corner impedance; however, it has no effect on the topological properties. Our system provides a highly tunable platform in which to explore the intriguing topological properties of higher-order topological insulators.

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  • Received 23 July 2019
  • Accepted 8 September 2020

DOI:https://doi.org/10.1103/PhysRevB.102.104109

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Jien Wu1, Xueqin Huang1, Jiuyang Lu1, Ying Wu1, Weiyin Deng1,*, Feng Li1,†, and Zhengyou Liu2,3,‡

  • 1School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong 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

  • *dengwy@scut.edu.cn
  • phlifeng@scut.edu.cn
  • zyliu@whu.edu.cn

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Issue

Vol. 102, Iss. 10 — 1 September 2020

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