Li Quan, Ph.D.

Welcome to Li Quan's homepage!

Li Quan received his B.S. and M.S. degree from Nanjing University in 2011 and 2014, and his Ph.D. degree in Electrical and Computer Engineering from the University of Texas at Austin in 2020. He is now a Senior Acoustic Engineer at Apple Inc.

Li Quan's research mainly aims to understand the physical mechanisms of interactions between waves and matters, especially in the scope of acoustics, design novel devices, and seek their possible biomedical and industrial applications. Li Quan's research span over a broad scope of acoustics, such as acoustic metamaterials, acousto-fluidic devices, ultrasound non-destructive testing, the physical model of MEMS microphones, etc. In the recent years, his main efforts have been devoted to the research of acoustic metamaterials, their exotic phenomena, and their industry applications, with particular focuses on Willis coupling effect, non-reciprocal acoustic devices, low-frequency acoustic beam collimation and acoustic effective impedance modulation.

Li Quan's main scientific contributions are the proposed theory of the bound of Willis coupling indicating that the Willis coupling effect can be as strong as the direct polarizabilities. He has also proposed the systematic design approach of acoustic inclusions which can reach the maximum Willis coupling. To date, he has authored and/or co-authored 18 journal papers, 16 conference papers and 4 patents, among which are published in highly selective journals, including 3 Nature Communications and 3 Physical Review Letters. He is also a reviewer for 22 international peer-review journals.

• Sep. 2018: Our paper "Non-Reciprocal Willis Coupling in Zero-index Moving Media" is available on arXiv.