Acoustic lattices have proven to be a robust experimental platform for showcasing quantum mechanical phenomena on a macroscopic scale. In this presentation, I will illustrate examples of acoustic analogs of condensed matter problems, with a particular focus on those intertwined with topological physics. I will start by delving into the origins of the connection between acoustics and quantum mechanics, drawing parallels between their governing equations and introducing a foundational acoustic system – coupled acoustic cavities, which is the building block of many acoustic lattice designs possessing topological phases. I will demonstrate that, with proper design, this model interestingly can exhibit chiral symmetry, a feature that is crucial for emulating condensed matter problems. Expanding on this, I will extend the coupled acoustic cavity model to acoustic lattices, showcasing their capacity to manifest topological higher-order corner modes. These lattices further reveal symmetry-protected zero-energy topological states at disclinations, a particular type of topological defect. Additionally, I will discuss the emergence of a Z-Classified Chiral-Symmetric Higher-Order Topological Insulator within these acoustic lattices. Finally, I will briefly discuss future directions of this exciting topic.
Yun Jing received his B.S. degree in acoustics from Nanjing University, China, in 2006 and his Ph.D. degree from Rensselaer Polytechnic Institute in 2009 with a focus on architectural acoustics. He is currently a professor in the Graduate Program in Acoustics at Penn State University. Prior to joining Penn State University in 2020, he was a research fellow at Brigham and Women's Hospital during 2009-2011, and an assistant professor and associate professor at North Carolina State University during 2011-2019. He is broadly interested in acoustic functional materials, biomedical ultrasound, nonlinear acoustics, and noise control. He has published over 100 peer-reviewed scientific manuscripts. He is a fellow of the Acoustical Society of America and a senior member of IEEE. He has received numerous awards such as the 2018 R. Bruce Lindsay Award from the Acoustical Society of America, the 2018 IEEE Ultrasonics Early Career Investigator award, 2018 MIT Technology Review Innovator under 35 China award, and the IEEE UFFC Star Ambassador Lectureship Award.