Fig. 4: Acoustic corner states in the second-order topological insulator phase. | Communications Physics

Fig. 4: Acoustic corner states in the second-order topological insulator phase.

From: Variable-order topological insulators

Fig. 4

a Photo of triangle-shaped phononic crystal (PC) with \({d}_{r}/{d}_{0}=0.6\). b Simulated eigenfrequency of the triangle-shaped PC. Six corner states exist in the band gap. c Measured corner, edge and bulk response spectra as functions of frequency. d Measured pressure fields of lower bulk, edge, corner and higher bulk states. Color maps denote the magnitudes of the sound pressure \(\left|{{{{{\rm{P}}}}}}\right|\).

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