Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.24: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Chern insulators at finite magnetic fields in twisted bilayer graphene. — •Miguel Sánchez1, Tobias Stauber1,2, and José González3 — 1ICMM CSIC Madrid — 2University of Augsburg — 3IEM CSIC Madrid
We calculate the topological properties (Chern numbers) of the correlated insulator states of magic angle twisted bilayer graphene (TBG) observed at integer number of electrons per Moiré unit cell.
Using the periodic Landau gauge to make manifest the magnetic translation symmetry and the Peierls' substitution, we obtain the Landau levels and Hofstadter butterfly of TBG. Via a self-consistent Hartree-Fock method we study electron correlations and the Chern insulator states at finite magnetic fields in our atomistic tight-binding description. Also, recent discoveries drive our attention to spontaneous translation symmetry breaking at half-integer fillings.