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• W2783649681 abstract "Topologically protected wave engineering in artificially structured media resides at the frontier of ongoing metamaterials research, which is inspired by quantum mechanics. Acoustic analogs of electronic topological insulators have recently led to a wealth of new opportunities in manipulating sound propagation by means of robust edge mode excitations through analogies drawn to exotic quantum states. A variety of artificial acoustic systems hosting topological edge states have been proposed analogous to the quantum Hall effect, topological insulators, and Floquet topological insulators in electronic systems. However, those systems were characterized by a fixed geometry and a very narrow frequency response, which severely hinders the exploration and design of useful applications. Here we establish acoustic multipolar pseudospin states as an engineering degree of freedom in time-reversal invariant flow-free phononic crystals and develop reconfigurable topological insulators through rotation of their meta-atoms and reshaping of the metamolecules. Specifically, we show how rotation forms man-made snowflakelike molecules, whose topological phase mimics pseudospin-down (pseudospin-up) dipolar and quadrupolar states, which are responsible for a plethora of robust edge confined properties and topological controlled refraction disobeying Snell's law." @default.
• W2783649681 created "2018-01-26" @default.
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• W2783649681 date "2017-12-29" @default.
• W2783649681 modified "2023-10-16" @default.
• W2783649681 title "Experimental verification of acoustic pseudospin multipoles in a symmetry-broken snowflakelike topological insulator" @default.
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• W2783649681 doi "https://doi.org/10.1103/physrevb.96.241306" @default.
• W2783649681 hasPublicationYear "2017" @default.
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