期刊
PHYSICAL REVIEW LETTERS
卷 130, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.130.017201
关键词
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The topological features in ancient braiding and knotting arts have significant impacts on daily life and cutting-edge science. Recent efforts have been focused on the braiding topology of complex Bloch bands in non-Hermitian systems, surpassing the established classifications in Hermitian systems. In this study, the first acoustic realization of topological non-Hermitian Bloch braids was presented, using a two-band model that can easily achieve any desired knot structure. The non-Hermitian bands were synthesized using a simple binary cavity-tube system, enabling the direct visualization of various two-band braiding patterns and observation of highly elusive topological phase transitions.
Topological features embedded in ancient braiding and knotting arts endow significant impacts on our daily life and even cutting-edge science. Recently, fast growing efforts are invested to the braiding topology of complex Bloch bands in non-Hermitian systems. This new classification of band topology goes far beyond those established in Hermitian counterparts. Here, we present the first acoustic realization of the topological non-Hermitian Bloch braids, based on a two-band model easily accessible for realizing any desired knot structure. The non-Hermitian bands are synthesized by a simple binary cavity-tube system, where the long-range, complex-valued, and momentum-resolved couplings are accomplished by a well -controlled unidirectional coupler. In addition to directly visualizing various two-band braiding patterns, we unambiguously observe the highly elusive topological phase transitions between them. Not only do our results provide a direct demonstration for the non-Hermitian band topology, but also the experimental techniques open new avenues for designing unconventional acoustic metamaterials.
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