Lossy acoustic metamaterials for higher-order Weyl exceptional ring (IMAGE)
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IMAGE3: Higher-order topological properties of the acoustic metamaterials. a, Measured hinge dispersion (colormap) for the left hinge. Simulated result is denoted by gray dots and the topological hinge states are highlighted in blue. b, Measured response spectra for the left (blue line) and right (red line) hinges of the acoustic metamaterials. The blue and red regions label the frequency ranges of the topological hinge states and trivial hinge states, respectively. c, Distribution of Fermi arc surface states in a rhombic prism acoustic metamaterial, showing no skin effect. d, Distribution of Fermi arc surface states in a tilted prism acoustic metamaterial, showing hinge-dependent skin effect.
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