TY - JOUR
T1 - Realization of a Z -Classified Chiral-Symmetric Higher-Order Topological Insulator in a Coupling-Inverted Acoustic Crystal
AU - Wang, Dongyi
AU - Deng, Yuanchen
AU - Ji, Jun
AU - Oudich, Mourad
AU - Benalcazar, Wladimir A.
AU - Ma, Guancong
AU - Jing, Yun
N1 - Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/10/13
Y1 - 2023/10/13
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevLett.131.157201
DO - 10.1103/PhysRevLett.131.157201
M3 - Article
C2 - 37897754
AN - SCOPUS:85175279666
SN - 0031-9007
VL - 131
JO - Physical review letters
JF - Physical review letters
IS - 15
M1 - 157201
ER -