Uncovering the spin ordering in magic-angle graphene via edge state equilibration

Jesse C. Hoke, Yifan Li, Julian May-Mann, Kenji Watanabe, Takashi Taniguchi, Barry Bradlyn, Taylor L. Hughes and Benjamin E. Feldman ()
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Jesse C. Hoke: Stanford University
Yifan Li: Stanford University
Julian May-Mann: Stanford University
Kenji Watanabe: National Institute for Materials Science
Takashi Taniguchi: National Institute for Materials Science
Barry Bradlyn: University of Illinois at Urbana-Champaign
Taylor L. Hughes: University of Illinois at Urbana-Champaign
Benjamin E. Feldman: Stanford University

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract The flat bands in magic-angle twisted bilayer graphene (MATBG) provide an especially rich arena to investigate interaction-driven ground states. While progress has been made in identifying the correlated insulators and their excitations at commensurate moiré filling factors, the spin-valley polarizations of the topological states that emerge at high magnetic field remain unknown. Here we introduce a technique based on twist-decoupled van der Waals layers that enables measurement of their electronic band structure and–by studying the backscattering between counter-propagating edge states–the determination of the relative spin polarization of their edge modes. We find that the symmetry-broken quantum Hall states that extend from the charge neutrality point in MATBG are spin unpolarized at even integer filling factors. The measurements also indicate that the correlated Chern insulator emerging from half filling of the flat valence band is spin unpolarized and suggest that its conduction band counterpart may be spin polarized.

Date: 2024
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DOI: 10.1038/s41467-024-48385-z

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