Details

Autor(en) / Beteiligte

• Zhang, Li
• Yang, Yihao
• Ge, Yong
• Guan, Yi-Jun
• Chen, Qiaolu
• Yan, Qinghui
• Chen, Fujia
• Xi, Rui
• Li, Yuanzhen
• Jia, Ding
• Yuan, Shou-Qi
• Sun, Hong-Xiang
• Chen, Hongsheng
• Zhang, Baile

Titel

Acoustic non-Hermitian skin effect from twisted winding topology

Ist Teil von

• Nature communications, 2021-11, Vol.12 (1), p.6297-6297, Article 6297

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Electronic Journals Library

Beschreibungen/Notizen

• 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.