2023/05/18 by Yuzeng Li, Qicheng Zhang, Li, Yuzeng +3
Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #Geophysical and Geoelectrical Methods #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Theoretical and Computational Physics #Topological Materials and Phenomena
paper · pdf · doi:10.48550/arxiv.2305.10948
openalex publication_date 2023/05/18 · openalex created_date 2023/05/21 · openalex updated_date 2026/07/28
Recently, the higher-order topological phases from the chiral AIII symmetry classes are characterized by a Z topological invariant known as the multipole chiral numbers, which indicate the number of degenerate zero-energy corner states at each corner. Here, we report the first experimental realization of higher-order topological insulators protected by multipole chiral numbers with using acoustic crystals. Our acoustic measurements demonstrate unambiguously the emergence of multiple corner states in the middle of the gap, as predicted by the quantized multipole chiral numbers. Our study may provoke new possibilities for controlling sound, such as acoustic sensing and energy trapping.