Higher-order topological acoustic metamaterials on kagome lattices, which host topologically protected corner states, can confine sound at corners. This may lead to applications of acoustic metamaterials in local acoustic field enhancement, trapping and manipulating of particles, and acoustic sensing and probing.
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Liu, Z. Trapping sound at corners. Nature Mater 18, 98–99 (2019). https://doi.org/10.1038/s41563-018-0274-3
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