报告题目: Symmetry, Topology, and Many-Body Interactions in Moiré Systems
Van der Waals bilayers with a small difference in the lattice constant and/or orientation have long-period moiré patterns, which provide vast new opportunities to control material properties. I will focus on twisted bilayer graphene (TBG) and show how the interplay between many-body interactions, Bloch band symmetry and topology of TBG can lead to possible unconventional superconductivity as well as quantum anomalous Hall effect [1, 2]. If time allows, I will also describe our theoretical proposal of using twisted bilayer transition metal dichalcogenides as quantum simulators of Hubbard model [3, 4], and discuss recent experimental realizations.
1. F. Wu, A. H. MacDonald, and I. Martin, Phys. Rev. Lett. 121, 257001 (2018).
2. F. Wu, S. Das Sarma, Phys. Rev. Lett. 124, 046403 (2020).
3. F. Wu, T. Lovorn, E. Tutuc, A. H. MacDonald, Phys. Rev. Lett. 121, 026402 (2018).
4. F. Wu, T. Lovorn, E. Tutuc, I. Martin, A. H. MacDonald, Phys. Rev. Lett. 122, 086402 (2019).
Speaker: Fengcheng Wu obtained his B. S. in Physics from University of Science and Technology of China in 2011 and Ph.D. in Physics from The University of Texas at Austin in 2016. He performed postdoc research at Argonne National Laboratory and later at University of Maryland.