报告题目：流固耦合起源的拓扑声学现象

Topological phononics arising from fluid-solid interactions

报 告 人：吴肖肖（香港科技大学（广州），助理教授）

报告时间：2024年1月10日（周三）下午15:00

报告地点：物理科学与技术学院新楼D505

报告摘要：

近年来，在光、声等经典波系统中发现了多类非平凡的拓扑能带结构，对于未来器件开发和应用（如通信、传感、能量收集等）具有重要意义。与光波不同，声波在流体和固体中具有截然不同的动力学与对称性，可以分别表示为标量和矢量声场。目前对声波中拓扑能带结构的探索往往单独关注流体或固体中的声波，忽略了它们之间可能存在的流固耦合，一般认为这至多只会导致频率偏移等非本质的影响。而在本项工作中，我们发现流体与固体中声波的耦合其实可以产生非常丰富的拓扑能带结构。作为示例，我们利用简单的三维声子晶体实现了第二类拓扑节环及节链，并实验观测了其诱导的强烈倾斜的鼓膜表面态。这一方法为探索声波系统中的拓扑物理提供了一种新的可能。

报告人简介：

Dr. Xiaoxiao Wu is an Assistant Professor of Advanced Materials Thrust at HKUST(GZ). He received Bachelor’s degree in Physics from Nanjing University in 2014, and PhD degree in Physics from Hong Kong University of Science and Technology in 2018. His research features extraordinary manipulations of waves beyond conventional limits using metamaterials, which control wave-matter interaction on demand through designed ensembles of artificial structures (“meta-atoms”). With a problem-driven approach, his research experiences span on a variety areas of metamaterials, including wave-functional metamaterials, which aim at challenges impossible for plain natural materials, and topological metamaterials, which aim at exploring the profound topological physics in photonic and phononic systems for fundamental progress and also exotic applications. Until now, he has authored more than 30 journal papers, and has published as first author in top journals such as Nature Communications and Physical Review Letters. According to Google Scholar, Dr. Wu has been cited more than 1300 times, and more than 800 times as the first author, co-first author, or corresponding author. Dr. Wu’s h-index is 18. He also has 4 granted patents on metamaterials.

邀 请 人：肖孟 教授