Time：13:30-15:00, Thursday, March 23rd, 2023

Host: Prof. Congjun Wu, Chair Professor of School of Science, Westlake University

Venue: E10-211, Yungu Campus, Westlake University

Zhida Song

International Center for Quantum Materials (ICQM), Peking University

Biography:

Dr. Zhi-Da Song, Assistant Professor at the International Center for Quantum Materials (ICQM) of Peking University. Song got his Bachelor's degree in 2013 from the University of Electronic Science of Technology of China. He received his Ph.D. in 2018 from the Institute of Physics of the Chinese Academy of Sciences. During 2018-2021, Song was a postdoctoral researcher in Andrei Bernevig’s group at Princeton University. In 2021, Song joined ICQM as an assistant professor. His research interests extend over the theoretical studies of topological phases of matter, quantum Hall systems, and low-dimensional strongly interacting systems.

Abstract:

A number of interesting physics phenomena have been discovered in magic-angle twisted bilayer graphene (MATBG), such as superconductivity, correlated gapped and gapless phases, etc. In this work, we point out that a series of exotic phenomena (beyond mean-field theories) result from a simple unified mechanism - the Kondo effect. Using realistic parameters given by the previous THF model work, the computed spectral densities, entropies, and spin susceptibilities are quantitatively comparable to experiments. We predict that the ground state in a wide range of fractional fillings is the heavy Fermi liquid, and conjecture that the heavy Fermi liquid is the parent state of the observed unconventional superconductivity.

Contact:

School of Science, Yue Zhang, Email: zhangyue62@westlake.edu.cn