Topological insulators are a class of materials that have garnered significant interest in acoustics for their unique ability to control sound waves in novel ways. These materials exhibit edge states that are immune to scattering from imperfections, allowing sound waves to travel along their boundaries without loss caused by detrimental diffraction. By leveraging topological metamaterials, we investigate a plethora of phenomena, like higher-order topology, defect and Majorana bound states, non-Hermitian topology, etc. Applications range from advanced noise-cancellation systems to improved acoustic waveguides and sensors. Research in this field bridges the gap between physics and engineering, opening new pathways for innovative acoustic technologies. This exciting intersection of topological physics and acoustics promises to revolutionize how we harness and control sound.
