Three-Dimensional Acoustic Double-Zero-Index Medium with a Fourfold Degenerate Dirac-like Point

Changqing Xu, Guancong Ma, Zeguo Chen, Jie Luo, Jinjie Shi, Yun Lai, Ying Wu

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We report the first realization of a three-dimensional (3D) acoustic double-zero-index medium (DZIM) made of a cubic lattice of metal rods. While the past decade has seen several realizations of 2D DZIM, achieving such a medium in 3D has remained an elusive challenge. Here, we show how a fourfold degenerate point with conical dispersion can be induced at the Brillouin zone center, such that the material becomes a 3D DZIM with the effective mass density and compressibility simultaneously acquiring near-zero values. To demonstrate the functionalities of this new medium, we have fabricated an acoustic waveguide of 3D DZIM in form of a
Original languageEnglish (US)
JournalPhysical Review Letters
Volume124
Issue number7
DOIs
StatePublished - Feb 21 2020

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