Observation of topological valley transport of sound in sonic crystals
arXiv:1709.05920 · doi:10.1038/nphys3999
Abstract
Valley pseudospin, labeling quantum states of energy extrema in momentum space, is attracting tremendous attention1-13 because of its potential in constructing new carrier of information. Compared with the non-topological bulk valley transport realized soon after predictions1-5, the topological valley transport in domain walls6-13 is extremely challenging owing to the inter-valley scattering inevitably induced by atomic scale imperfectness, until the recent electronic signature observed in bilayer graphene12,13. Here we report the first experimental observation of topological valley transport of sound in sonic crystals. The macroscopic nature of sonic crystals permits the flexible and accurate design of domain walls. In addition to a direct visualization of the valley-selective edge modes through spatial scanning of sound field, reflection immunity is observed in sharply curved interfaces. The topologically protected interface transport of sound, strikingly different from that in traditional sound waveguides14,15, may serve as the basis of designing devices with unconventional functions.
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Cited by in corpus (196)
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- Terahertz topological photonics for on-chip communication
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- Visualization of unidirectional optical waveguide using topological photonic crystals made of dielectric material
- Observation of second-order topological insulators in sonic crystals
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- Direct Observation of Valley-polarized Topological Edge States in Designer Surface Plasmon Crystals
- Observation of Photonic Topological Valley-Hall Edge States
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- Topological Sound
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- Non-linear second-order topological insulators
- Topological Phase Transition in Mechanical Honeycomb Lattice
- Topological phononic insulator with robustly pseudospin-dependent transport
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- Theory and Experimental Investigation of the Quantum Valley Hall Effect
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- Experimental Observation of Acoustic Weyl Points and Topological Surface States
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- Observation of topological edge states of sound at a momentum away from the high-symmetry point
- Designing multi-directional energy-splitters and topological valley supernetworks
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- Mechanical analogue of a Majorana bound state
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- Breakdown of Conventional Winding Number Calculation in One-Dimensional Lattices with Interactions Beyond Nearest Neighbors
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- Topologically invisible defects in chiral mirror lattices
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- Quasi-One-Dimensional Higher-Order Topological Insulators
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- Valley-Chern Effect with LC-Resonators: A Modular Platform
- Floquet topological insulators with hybrid edges
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- Three-dimensional valley-contrasting sound
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- Confining and channeling sound through coupled resonators
- Symmetry-driven Phononic Metamaterials
- Metamaterials and Fluid Flows
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- Observation of topological valley Hall edge states in honeycomb lattices of superconducting microwave resonators
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- Designing topological acoustic lattices via electroacoustic analogies
- Acoustic Metacages for Omnidirectional Sound Shielding
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- Magnetic doping-induced second-order and first-order topological phase transition inthe photonic alloy
- Wilson Loop and Topological Properties in 3D Woodpile Photonic Crystal
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- Topological defect states in elastic phononic plates
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- Observation of the topological edge state in X-ray band
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