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Underwater Acoustic Modulating based on Selective Higher-order Topological Corner States

Haobin Zhang, Jing Cai, Quanquan Shi, Jiajun Lu
International Core Journal of Engineering, (2025), Vol.11, No.3, pp.91-98
Published: February 18, 2025
DOI: 10.6919/ICJE.202503_11(3).0011
PDF: Download Full Text PDF
Abstract

The discovery of Higher-order topological insulators (HTIs) opens new opportunities for the advancement of condensed matter physics and material science topological insulators are a new class of special topological insulators that have been discovered in many classical wave systems in recent years. In this paper, acoustic Dirac degeneracy is achieved by simply rotating scatterers in acoustic crystals, with degeneracy induced accidentally. It provides a new approach for creating higher-order topological insulators in acoustic systems. We observe two kinds of structures and get the gapped one-dimensional (1D) edge states and the gapped zero-dimensional (0D) corner states. At the same time, the edge state is further observed along the interface with two different topological phononic crystals. The topological corner states in this paper enrich the study of higher-order topological insulators and have edge states, which provide a new platform for acoustic systems' transmission properties.

Keywords: Higher-order Topological Insulator; Dirac Degeneracy; Edge States; Corner States.
APA Citation: Haobin Zhang, Jing Cai, Quanquan Shi, Jiajun Lu (2025). Underwater Acoustic Modulating based on Selective Higher-order Topological Corner States. International Core Journal of Engineering, 11(3), 91-98. https://doi.org/10.6919/ICJE.202503_11(3).0011

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