Realization of a Z -Classified Chiral-Symmetric Higher-Order Topological Insulator in a Coupling-Inverted Acoustic Crystal

Dongyi Wang, Yuanchen Deng, Jun Ji, Mourad Oudich, Wladimir A. Benalcazar, Guancong Ma, Yun Jing

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Higher-order topological band theory has transformed the landscape of topological phases in quantum and classical systems. Here, we experimentally demonstrate a two-dimensional higher-order topological phase, referred to as the multiple chiral topological phase, which is protected by a multipole chiral number (MCN). Our realization differs from previous higher-order topological phases in that it possesses a larger-than-unity MCN, which arises when the nearest-neighbor couplings are weaker than long-range couplings. Our phase has an MCN of 4, protecting the existence of 4 midgap topological corner modes at each corner. The multiple topological corner modes demonstrated here could lead to enhanced quantum-inspired devices for sensing and computing. Our study also highlights the rich and untapped potential of long-range coupling manipulation for future research in topological phases.

Original languageEnglish (US)
Article number157201
JournalPhysical review letters
Issue number15
StatePublished - Oct 13 2023

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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