Using 3D metal-printing topological materials to manipulate full-vector elastic waves. (IMAGE)
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IMAGE1: Bulk dispersions of the single layer and bilayer elastic metamaterials. a and b, Unit cell and bulk dispersion of the single layer elastic metamaterial. A quadratic degeneracy is preserved at the M point. The inset shows the first Brillouin zone. c and d, Unit cell and bulk dispersion of the bilayer elastic metamaterial. Chiral interlayer coupling is introduced by four tilted pillars, which opens a topologically nontrivial band gap (the grey region in d). In b and d, the colour maps represent the proportion of the out-of-plane displacement, and the black solid curves denote the fitting data of the effective Hamiltonians. Inset: the non-Abelian Wilson loop.
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