Topological Acoustics
arXiv:1411.7100 · doi:10.1103/PhysRevLett.114.114301
Abstract
The manipulation of acoustic wave propagation in fluids has numerous applications, including some in everyday life. Acoustic technologies frequently develop in tandem with optics, using shared concepts such as waveguiding and metamedia. It is thus noteworthy that an entirely novel class of electromagnetic waves, known as topological edge states, has recently been demonstrated. These are inspired by the electronic edge states occurring in topological insulators, and possess a striking and technologically promising property: the ability to travel in a single direction along a surface without backscattering, regardless of the existence of defects or disorder. Here, we develop an analogous theory of topological fluid acoustics, and propose a scheme for realizing topological edge states in an acoustic structure containing circulating fluids. The phenomenon of disorder-free one-way sound propagation, which does not occur in ordinary acoustic devices, may have novel applications for acoustic isolators, modulators, and transducers.
4 pages, 3 figures
References in corpus (3)
Cited by in corpus (64)
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- Photonic Topological Anderson Insulators
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- Topological Photonic Quasicrystals: Fractal Topological Spectrum and Protected Transport
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- Non-Hermitian Aharonov-Bohm Cage
- Optical Control of Topological Polariton Phase in a Perovskite Lattice
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- Experimental Realization of Acoustic Bianisotropic Gratings
- Bending sound around sharp corners without using topological edge states
- Experimental realization of three-dimensional elastic phononic topological insulator
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