Lossy acoustic metamaterials for higher-order Weyl exceptional ring (IMAGE)
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IMAGE2: Acoustic realization of the higher-order Weyl exceptional ring semimetal and corresponding first-order topological properties. a, Photograph of the non-Hermitian acoustic metamaterial sample. b, Measured isofrequency contour (colormap) at the Weyl exceptional ring frequency. c, Measured (colormap) and simulated (green lines) isofrequency contour of the surface waves at the Weyl exceptional ring frequency, where the surface states connect the projections of Weyl exceptional rings with opposite Chern numbers. d, Distribution of all eigenstates of the rhombic prism acoustic metamaterial, showing the surface-dependent skin effect of the bulk states.
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