The Emergence of Superconductivity and Magnetism from Stacking and Twisting 2D Carbon Sheets

  • Event Date: 2022-09-28
  • Computational quantum materials
  • Speaker: Chunli Huang (Los Alamos National Lab., USA )  /  Host:
    Place: Chee-Chun Leung Cosmology Hall 4F, NTU

Speaker:Chunli Huang (Los Alamos National Lab., USA )
Time:2022/09/28 (Wed.) 14:30
Place:4F Lecture Hall, Cosmology Hall NTU & Online

Link for online:
Meeting number:2557 397 7258
Password:b4qGF47X4hp (24743479 from phones and video systems)

Recent advances in stacking and twisting two dimensional (2D) materials have led to the development of highly tunable platforms for the exploration of topological and strongly correlated states. For example, Zhou et. al have recently uncovered half-metal, quarter-metal, spin-triplet superconductor, and spin-singlet superconductor states by simply stacking 2D carbon sheets under an applied electric field. I will provide a complete theoretical interpretation of their experimental data and describe how they led us to discover a novel type of Fermi liquid that undergoes spontaneous clustering. In the second part of the talk, I will discuss our recent theoretical proposal for the microscopic theory of superconductivity in magic angle twisted bilayer graphene (MATBG) and describe how it satisfies most of the experimental constraints, including the mismatch between conditions that favor superconductivity and the anomalous Hall effect, the influence of aligned Boron-Nitride, and particle-hole asymmetry.