Acoustic non-Hermitian skin effect from twisted winding topology

Li Zhang, Yihao Yang (), Yong Ge, Yi-Jun Guan, Qiaolu Chen, Qinghui Yan, Fujia Chen, Rui Xi, Yuanzhen Li, Ding Jia, Shou-Qi Yuan, Hong-Xiang Sun (), Hongsheng Chen () and Baile Zhang ()
Additional contact information
Li Zhang: Zhejiang University
Yihao Yang: Zhejiang University
Yong Ge: Jiangsu University
Yi-Jun Guan: Jiangsu University
Qiaolu Chen: Zhejiang University
Qinghui Yan: Zhejiang University
Fujia Chen: Zhejiang University
Rui Xi: Zhejiang University
Yuanzhen Li: Zhejiang University
Ding Jia: Jiangsu University
Shou-Qi Yuan: Jiangsu University
Hong-Xiang Sun: Jiangsu University
Hongsheng Chen: Zhejiang University
Baile Zhang: Nanyang Technological University

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract The recently discovered non-Hermitian skin effect (NHSE) manifests the breakdown of current classification of topological phases in energy-nonconservative systems, and necessitates the introduction of non-Hermitian band topology. So far, all NHSE observations are based on one type of non-Hermitian band topology, in which the complex energy spectrum winds along a closed loop. As recently characterized along a synthetic dimension on a photonic platform, non-Hermitian band topology can exhibit almost arbitrary windings in momentum space, but their actual phenomena in real physical systems remain unclear. Here, we report the experimental realization of NHSE in a one-dimensional (1D) non-reciprocal acoustic crystal. With direct acoustic measurement, we demonstrate that a twisted winding, whose topology consists of two oppositely oriented loops in contact rather than a single loop, will dramatically change the NHSE, following previous predictions of unique features such as the bipolar localization and the Bloch point for a Bloch-wave-like extended state. This work reveals previously unnoticed features of NHSE, and provides the observation of physical phenomena originating from complex non-Hermitian winding topology.

Date: 2021
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Citations: View citations in EconPapers (7)

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DOI: 10.1038/s41467-021-26619-8

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