Tunable Acoustic Valley-Hall Edge States in Reconfigurable Phononic Elastic Waveguides

By Ting-Wei Liu, Fabio Semperlotti. 2017

204 citations recorded by the source corpus.

This study investigates the occurrence of acoustic topological edge states in a 2D phononic elastic waveguide due to a phenomenon that is the acoustic analogue of the quantum valley Hall effect. We show that a topological transition takes place between two lattices having broken space inversion symmetry due to the application of a tunable strain field. This condition leads to the formation of gapless edge states at the domain walls, as further illustrated by the analysis of the bulk-edge correspondence and of the associated topological invariants. Although time reversal symmetry is still intact in these systems, the edge states are topologically protected when inter-valley mixing is either weak or negligible. Interestingly, topological edge states can also be triggered at the boundary of a single domain if boundary conditions are properly selected. We also show that the static modulation of the strain field allows tuning the response of the material between the different supported edge states.

Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering

View Paper: https://www.semanticscholar.org/paper/68118f3e143246142c3e3e9af8ed5fcfb79a3b36

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In Atomic and Molecular Physics, and Optics

In Biomedical Engineering

Citations in the corpus

Tailoring Structure‐Borne Sound through Bandgap Engineering in Phononic Crystals and Metamaterials: A Comprehensive Review (2022, methodology): “Another feasible method to create elastic topological Valley lattices is by tuning the strain field in materials, which is especially effective in truss-like lattices [295,296].”