Title: Research advances in acoustic analogous topological effects and applications

Speaker: Zhiwang Zhang, Department of Physics, Nanjing University

Time&Location: 12:00 pm, April. 4,  Room B501, Tangzhongying Building 

Abstract: As a new kind of “super materials”, acoustic metamaterial was first proposed at the beginning of this century, which provided novel ways and methods to the sound field modulation in complex media. Therein, the acoustic propagations in the periodic artificial structures have attracted wide interests. This kind of structure is known as sonic crystals, in which the multiple scattering induces a series of intriguing phenomena accompanied by special dispersions. Most recently, studying topological effects in classical systems starts to attract more and more attentions. Compared with the condensed matter physics, acoustic metamaterials and sonic crystals have provides ideal platforms for realizing analogous topological effects thanks to the precise and controllable fabrications and measurements, and many interesting Hermitian and non-Hermitian topological acoustic effects have been reported. This review will introduce the recent advances in topological acoustics. Starting from some basic concepts and realization methods of the topological acoustics, we mainly focus on the studies on the one-dimensional (1D) topological acoustic systems, the 2D analogous quantum Hall effect, quantum spin-Hall effect, quantum valley-Hall effect, higher-order topological insulators, Hermitian/non-Hermitian topological acoustics, and the related topological acoustic functional devices and applications.

Biography: Dr. Zhiwang Zhang is an Assistant Professor in Institute of Acoustics, Department of Physics, Nanjing University, who focuses on the study of the acoustic metamaterials and new-principle functional devices. He obtained his PhD degree from Nanjing University in 2020 and then followed by a postdoc. He is hired as the Assistant Professor since this year. He has published 25 SCI papers, which include 19 papers published in Nature, PRL, NC, AM and et al. as the first/(co-)corresponding author. These publications have been non-self-cited more than 1000 times. Two papers have been selected as the ESI hot papers and three have been selected as ESI highly-cited papers. The applicant was supported by the China National Postdoctoral Program for Innovative Talents and his thesis was awarded the Outstanding Doctoral Thesis of the Acoustical Society of China.