On September 30, 2022, the Gezhi Forum (12th Lecture) of Peking University was successfully held in the Siyuan Multifunctional Hall of the School of Physics. Assistant Professor Huang Huaqing of the Institute of Theoretical Physics, School of Physics, Peking University, gave an academic report entitled "Topological State of Matter in Aperiodic Systems". The forum was chaired by Professor Li Dingping, Deputy Director of the Institute of Theoretical Physics.

Huang Huaqing first sorted out the development of topological quantum states of matter in recent years and pointed out the necessity of studying topological states in aperiodic systems. Then he briefly introduced the aperiodic systems including quasicrystalline and amorphous systems. Combined with the work of his research group, he focused on how to extend the study of topological states from crystals to aperiodic systems, and further elaborated on the novel high-order topological states caused by the special symmetry of quasicrystals. In addition, he also elaborated a counterintuitive theoretical discovery that atomic structural disorder by amorphization can in fact induce electronic order of topology in an otherwise topologically trivial crystal. Finally, he briefly summarizes the interdisciplinary research between aperiodic systems and topological quantum states of matter, and points out possible future development directions.

After the talk, Huang Huaqing interacted with the online and offline audiences on topics such as the specific calculation method of the topological state in aperiodic systems, and gave in-depth and simple answers one by one.

This forum was held simultaneously online and offline. More than 3,100 audiences watched the live broadcast through the Academic Platform.

Koushare Live Replay Link: https://www.koushare.com/lives/room/419495

About the Speaker:

Huaqing Huang is a researcher at the Institute of Theoretical Physics, School of Physics, Peking University. He received his Ph.D. from the Department of Physics of Tsinghua University in 2016, worked as a postdoctoral research fellow at the University of Utah from 2016 to 2020, and joined Peking University in 2020. His research interests are condensed matter theory and computational physics, and currently focuses on various novel topological properties of aperiodic systems. He has undertaken general projects of the National Natural Science Foundation of China and key research and development projects of the Ministry of Science and Technology, and published more than 60 SCI papers in journals such as Nature Communications, Physical Review Letters, and Nano Letters.