Observation of hybrid higher-order skin-topological effect in non-Hermitian topolectrical circuits

Deyuan Zou, Tian Chen (), Wenjing He, Jiacheng Bao, Ching Hua Lee, Houjun Sun () and Xiangdong Zhang ()
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Deyuan Zou: Beijing Institute of Technology
Tian Chen: Beijing Institute of Technology
Wenjing He: Beijing Institute of Technology
Jiacheng Bao: Beijing Institute of Technology
Ching Hua Lee: National University of Singapore
Houjun Sun: Beijing Institute of Technology
Xiangdong Zhang: Beijing Institute of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Robust boundary states epitomize how deep physics can give rise to concrete experimental signatures with technological promise. Of late, much attention has focused on two distinct mechanisms for boundary robustness—topological protection, as well as the non-Hermitian skin effect. In this work, we report the experimental realizations of hybrid higher-order skin-topological effect, in which the skin effect selectively acts only on the topological boundary modes, not the bulk modes. Our experiments, which are performed on specially designed non-reciprocal 2D and 3D topolectrical circuit lattices, showcases how non-reciprocal pumping and topological localization dynamically interplays to form various states like 2D skin-topological, 3D skin-topological-topological hybrid states, as well as 2D and 3D higher-order non-Hermitian skin states. Realized through our highly versatile and scalable circuit platform, theses states have no Hermitian nor lower-dimensional analog, and pave the way for applications in topological switching and sensing through the simultaneous non-trivial interplay of skin and topological boundary localizations.

Date: 2021
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DOI: 10.1038/s41467-021-26414-5

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