Topological acoustics

Abstract

Topological acoustics is an emerging field that lies at the intersection of condensed matter physics, mechanical structural design and acoustics engineering. It explores the design and construction of novel artificial structures, such as acoustic metamaterials and phononic crystals, to manipulate sound waves robustly, taking advantage of topological protection. Early work on topological acoustics was limited to duplicating topological phases that have been understood in condensed matter systems, but recent advances have shifted the paradigm to exploring novel topological concepts that are difficult to realize in other physical systems, such as various topological semimetal phases, and topological phases associated with Floquet engineering, fragile topology, non-Hermiticity and synthetic dimensions. These developments demonstrate the unique advantages of topological acoustic systems and their role in developing topological physics. In this Review, we survey the fundamental mechanisms, basic designs and practical realizations of topological phases in acoustic systems, and provide an overview of future directions and potential applications.

arXiv commentInvited review article, 24 pages, 6 figures

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Cited by in corpus (75)

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• Controlling mass and energy diffusion with metamaterials
• Experimental observation of temporal pumping in electro-mechanical waveguides
• Observation of exceptional points and skin effect correspondence in non-Hermitian phononic crystals
• Non-Hermitian Photonic Lattices: tutorial
• Observation of nonlinear disclination states
• Topological thermal transport
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• Spinful topological phases in acoustic crystals with projective PT symmetry
• Classification of time-reversal-invariant crystals with gauge structures
• Experimental observation of non-Hermitian higher-order skin interface states in topological electric circuits
• Demonstration of acoustic high-order Stiefel-Whitney semimetal in bilayer graphene sonic crystals
• Stiefel-Whitney topological charges in a three-dimensional acoustic nodal-line crystal
• Topological photonic alloy
• Local markers for crystalline topology
• Second Chern crystals in four-dimensional synthetic translation space with inherently nontrivial topology
• Observation of Large-Number Corner Modes in $\mathbb{Z}$-class Higher-Order Topolectrical Circuits
• Uncovering and experimental realization of multimodal 3D topological metamaterials for low-frequency and multiband elastic wave control
• Observation of scale-free localized states induced by non-Hermitian defects
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• Non-Abelian Braiding of Topological Edge Bands
• Evanescently coupled topological ring-waveguide systems for chip-scale ultrahigh frequency phononic circuits
• Exact Solutions Disentangle Higher-Order Topology in 2D Non-Hermitian Lattices
• Acoustic Bound States in the Continuum in Coupled Helmholtz Resonators
• Topological plasma transport from a diffusion view
• Kagome metals
• Roadmap for Animate Matter
• Dynamical Detection of Topological Spectral Density
• Monopole topological resonators
• Direct measurement of topological invariants through temporal adiabatic evolution of bulk states in the synthetic Brillouin zone
• Topological gap solitons in Rabi Su-Schrieffer-Heeger lattices
• Revealing the spatial nature of sublattice symmetry
• Band alignment effect in the topological photonic alloy
• Protection of Correlation-Induced Phase Instabilities by Exceptional Susceptibilities
• Hierarchical Topological States in Thermal Diffusive Networks
• Three-dimensional valley-contrasting sound
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