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Article overview
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Observation of topological valley modes in an elastic hexagonal lattice | | Javier Vila
; Raj K. Pal
; Massimo Ruzzene
; | | Date: |
13 May 2017 | | Abstract: | We report on the experimental observation of topologically protected edge
waves in a two-dimensional elastic hexagonal lattice. The lattice is designed
to feature K point Dirac cones that are well separated from the other numerous
elastic wave modes characterizing this continuous structure. We exploit the
arrangement of localized masses at the nodes to break mirror symmetry at the
unit cell level, which opens a frequency bandgap. This produces a non-trivial
band structure that supports topologically protected edge states along the
interface between two realizations of the lattice obtained through mirror
symmetry. Detailed numerical models support the investigations of the
occurrence of the edge states, while their existence is verified through
full-field experimental measurements. The test results show the confinement of
the topologically protected edge states along pre-defined interfaces and
illustrate the lack of significant backscattering at sharp corners. Experiments
conducted on a trivial waveguide in an otherwise uniformly periodic lattice
reveal the inability of a perturbation to propagate and its sensitivity to
backscattering, which suggests the superior waveguiding performance of the
class of non-trivial interfaces investigated herein. | | Source: | arXiv, 1705.8247 | | Services: | Forum | Review | PDF | Favorites | |
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