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Topological guiding of elastic waves in phononic metamaterials based on 2D pentamode
structures

A topological state with protected propagation of elastic waves is achieved by appropriately engineering a phononic metamaterial based on 2D pentamode structures in silicon. Gapless edge states in the designed structure, which are characterized by pseudospin-dependent transport, provide backscattering-immune propagation of the elastic wave along bend paths. The role of the states responsible for forward and backward transfer can be interchanged by design.

Yuning Guo, Thomas Dekorsy, and Mike Hettich
Nature, Scientific Reports 7, 18043 (2017)
DOI: 10.1038/s41598-017-18394- 8