腾讯会议ID：996-245-690
会议密码：0327

主持人：周毅   研究员

联系人：傅琦   (fuqi@iphy.ac.cn)

Abstract:
Moiré materials, formed by stacking two atomic layers with a small mismatch in lattice periods, can host a rich variety of collective phenomena driven by the interplay of strong electron correlations and band topology. Despite their promise, achieving a comprehensive understanding of the electronic structure of moiré flat bands has been challenging both experimentally and theoretically. The recently developed quantum twisting microscope (QTM) introduces a new tunneling probe for van der Waals materials. In this talk, I will present a theoretical framework for tunneling spectroscopy of moiré flat bands using the QTM, and show how this technique enables momentum-resolved measurements of electron spectral functions and neutral collective excitations in magic-angle twisted bilayer graphene. I will then discuss relevant QTM measurements and present a modified Hubbard model for the topological flat bands of twisted bilayer graphene to shed light on the experimental observations. This work provides a theoretical foundation for uncovering the many-body physics of van der Waals heterostructures through quantum twisting microscopy.

Brief CV of Dr. Nemin Wei:
Dr. Nemin Wei received his B.S. from the University of Science and Technology of China (USTC) in 2017, and his Ph.D. from the University of Texas at Austin in 2023. He subsequently joined Yale University as a Yale Prize Postdoctoral Fellow. His research focuses on theoretical modeling of low-dimensional quantum materials, particularly the collective behavior of electrons in moiré systems.