Hofstadter subband ferromagnetism and symmetry-broken Chern insulators in twisted bilayer graphene

By Yu Saito, Jingyuan Ge, L. Rademaker, Kenji Watanabe, Takashi Taniguchi, D. Abanin, A. Young. Nature Physics, 2020

252 citations recorded by the source corpus.

When the twist angle between two layers of graphene is approximately 1.1°, interlayer tunnelling and rotational misalignment conspire to create a pair of flat bands1 that are known to host various insulating, superconducting and magnetic states when they are partially filled2–7. Most work has focused on the zero-magnetic-field phase diagram, but here we show that twisted bilayer graphene in a finite magnetic field hosts a cascade of ferromagnetic Chern insulators with Chern number ∣C∣ = 1, 2 and 3. The emergence of the Chern insulators is driven by the interplay of the moiré superlattice with the magnetic field, which endows the flat bands with a substructure of topologically non-trivial subbands characteristic of the Hofstadter butterfly8,9. The new phases can be accounted for in a Stoner picture10; in contrast to conventional quantum Hall ferromagnets, electrons polarize into between one and four copies of a single Hofstadter subband1,11,12. Distinct from other moiré heterostructures13–15, Coulomb interactions dominate in twisted bilayer graphene, as manifested by the appearance of Chern insulating states with spontaneously broken superlattice symmetry at half filling of a C = −2 subband16,17. Our experiments show that twisted bilayer graphene is an ideal system in which to explore the strong-interaction limit within partially filled Hofstadter bands. In twisted bilayer graphene, the moiré potential, strong electron–electron interactions and a magnetic field conspire to split the flat band into topologically non-trivial subbands.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/0768414f6b5673a93e1eb1d065d21b6a183f4af8

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Citations in the corpus

Colloquium : Quantum anomalous Hall effect (2022, background): “In addition to the QAH states observed at zero magnetic field, TBG Chern insulator phases at the finite magnetic field have been found and studied by many different groups (Nuckolls et al., 2020; Saito et al., 2021; Wu et al., 2021).”