<This video is meant for academic purpose only.>

►【International Young Scholar Forum】

Title：Graphene: Plays More Than One Tune

Time: 14:00 pm, December 1st, 2020

Speaker: Guorui Chen, Associate professor, School of Physics and Astronomy, Shanghai Jiao Tong University

Abstract: 

2D material is a highly tunable system that provides the opportunity to design, create and study different physics for purposes. In this talk, I will take graphene as an example to show how we tune the electronic properties of graphene and study different physics varying from single-particle physics, to strongly correlated physics and topological physics. In particular, I will start with the band engineering of graphene on hBN moire superlattice. Then I will discuss a general route to engineer strongly correlated physics in two-dimensional moiré superlattices, and show the experimental realization of a tunable Mott insulator in the ABC stacked trilayer graphene (TLG)/hBN moiré superlattice. The moirésuperlattice in TLG/hBN heterostructures leads to narrow electronic minibands and allows for the observation of gate-tunable Mott insulator states at 1/4 and 1/2 fillings. Based on the trilayer graphene system, interesting signatures of superconductivity are observed at low temperatures near the 1/4 filling Mott insulating state. By simply tuning the gate voltages, a topological Chern insulator with Chern number C = 2 and ferromagnetism are experimentally observed in the non-trivial band in trilayer graphene system, which makes it possible to study Mott, superconductivity and topological physics in one system.

Brief CV of Prof. Guorui Chen:

Prof. Guorui Chen got his Bachelor's degree from Shandong University in 2010, and Ph.D. degree from Fudan University in 2016. After as a postdoc at UC Berkeley and LBNL from 2017 to 2020, he joined Shanghai Jiao Tong University as a tenure-track associate professor and PI. His research interests are mainly in high-quality two-dimensional materials and their van der Waals heterostructures, especially in quantum transport of the strongly correlated and topological effects of graphene moire systems. In recent years, more than ten articles have been published in journals such as Nature, Nature Physics, Nature Materials, and PRL.