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Title: Observation of hybrid higher-order skin-topological effect in non-Hermitian topolectrical circuits
Authors: Zou, Deyuan
Chen, Tian
He, Wenjing
Bao, Jiacheng
Lee, Ching Hua 
Sun, Houjun
Zhang, Xiangdong
Issue Date: 1-Dec-2021
Publisher: Nature Research
Citation: Zou, Deyuan, Chen, Tian, He, Wenjing, Bao, Jiacheng, Lee, Ching Hua, Sun, Houjun, Zhang, Xiangdong (2021-12-01). Observation of hybrid higher-order skin-topological effect in non-Hermitian topolectrical circuits. Nature Communications 12 (1) : 7201. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
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. © 2021, The Author(s).
Source Title: Nature Communications
ISSN: 2041-1723
DOI: 10.1038/s41467-021-26414-5
Rights: Attribution 4.0 International
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