Temperature-tunable topological zero-refraction acoustic metamaterials

• DOI: 10.3389/fmats.2024.1489885
• Publication Date: 2024-10-16T05:29:07Z
• Authors: Yangyang Chu; Tong Sun; Zhaohong Wang; Zhifeng Zhang
• Keywords: Acoustic Metamaterials; Zero (linguistics); Negative Refraction

Zero-refractive index metamaterials have a wide range of applications in directional transmission and wave-front shaping due to their unusual acoustic properties. However, for most given topological metamaterials, the operating frequency is relatively fixed effect temperature on properties rarely considered. Therefore, temperature-controlled tunable zero-refraction are proposed this paper. Firstly, metamaterial with quadruple degenerate Dirac-like points at center Brillouin zone constructed, influence analyzed. The results show that bandgap more sensitive temperature. existence pseudospin-polarized edge state demonstrated by analysing band structure supercells different phase phonon crystal. property states outcoupled into free space numerically demonstrated, non-contact active control frequencies can be realized This study provide corresponding reference intelligent near-zero refractive materials elastic wave collimation communication.