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Orbital-Flop Transition of Angular Momentum in a Topological Superfluid

https://doi.org/10.1103/PhysRevLett.121.255303

Zimmerman, A. M. ; Li, J. I. A. ; Nguyen, M. D. ; Halperin, W. P. ( December 2018 , Physical Review Letters)
Emergent Dirac Gullies and Gully-Symmetry-Breaking Quantum Hall States in ABA Trilayer Graphene

https://doi.org/10.1103/PhysRevLett.121.167601

Zibrov, A. A. ; Rao, P. ; Kometter, C. ; Spanton, E. M. ; Li, J. I. A. ; Dean, Cory R. ; Taniguchi, T. ; Watanabe, K. ; Serbyn, M. ; Young, A. F. ( October 2018 , Physical Review Letters)
Tuning electron correlation in magic-angle twisted bilayer graphene using Coulomb screening

https://doi.org/10.1126/science.abb8754

Liu, Xiaoxue ; Wang, Zhi ; Watanabe, K. ; Taniguchi, T. ; Vafek, Oskar ; Li, J. I. A. ( March 2021 , Science)

Controlling the strength of interactions is essential for studying quantum phenomena emerging in systems of correlated fermions. We introduce a device geometry whereby magic-angle twisted bilayer graphene is placed in close proximity to a Bernal bilayer graphene, separated by a 3-nanometer-thick barrier. By using charge screening from the Bernal bilayer, the strength of electron-electron Coulomb interaction within the twisted bilayer can be continuously tuned. Transport measurements show that tuning Coulomb screening has opposite effects on the insulating and superconducting states: As Coulomb interaction is weakened by screening, the insulating states become less robust, whereas the stability of superconductivity at the optimal doping is enhanced. The results provide important constraints on theoretical models for understanding the mechanism of superconductivity in magic-angle twisted bilayer graphene.

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