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In article number 1904682, Ying Cheng, Xiaojun Liu, Johan Christensen, and co‐workers propose the marriage of spoof surface acoustic waves and second‐order topological insulators supporting extremely confined corner states 50 times smaller than the wavelength. Besides the topological robustness against fabrication imperfections, a programmable device is designed to achieve acoustic imaging far beyond...
Higher‐order topological insulators (HOTIs) belong to a new class of materials with unusual topological phases. They have garnered considerable attention due to their capabilities in confining energy at the hinges and corners, which is entirely protected by the topology, and have thus become attractive structures for acoustic wave studies and control. However, for most practical applications at audible...
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