Quantum textures of the many-body wavefunctions in magic-angle graphene

Nuckolls, Kevin P.; Lee, Ryan L.; Oh, Myung Hwan; Wong, Dillon; Soejima, Tomohiro; Hong, Jee-Young; Călugăru, Dumitru; Herzog-Arbeitman, Jonah; Bernevig, B. Andrei; Watanabe, Kenji; Taniguchi, Takashi; Regnault, Nicolas; Zaletel, Michael P.; Yazdani, Ali

doi:10.1038/s41586-023-06226-x

Cited by 52 publications

(1 citation statement)

References 41 publications

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“…1 d, f). These peaks are consistent with the correlated insulators that have been previously observed in MATBG 8 , 12 , 13 , 34 – 39 , and they persist as the MLG is doped away from its CNP (Supplementary Fig. 2) .…”

Section: Resultssupporting

confidence: 90%

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

Hoke,

Li,

May-Mann

et al. 2024

Nat Commun

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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.

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Section: Resultssupporting

confidence: 90%

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

Hoke,

Li,

May-Mann

et al. 2024

Nat Commun

Self Cite

View full text Add to dashboard Cite

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Resolving exotic quantum states using scanning tunneling microscopy

Jeon,

2024

Current Applied Physics

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Nodal band-off-diagonal superconductivity in twisted graphene superlattices

Christos,

Sachdev,

Scheurer

2023

Nat Commun

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The superconducting state and mechanism are among the least understood phenomena in twisted graphene systems. Recent tunneling experiments indicate a transition between nodal and gapped pairing with electron filling, which is not naturally understood within current theory. We demonstrate that the coexistence of superconductivity and flavor polarization leads to pairing channels that are guaranteed by symmetry to be entirely band-off-diagonal, with a variety of consequences: most notably, the pairing invariant under all symmetries can have Bogoliubov Fermi surfaces in the superconducting state with protected nodal lines, or may be fully gapped, depending on parameters, and the band-off-diagonal chiral p-wave state exhibits transitions between gapped and nodal regions upon varying the doping. We demonstrate that band-off-diagonal pairing can be the leading state when only phonons are considered, and is also uniquely favored by fluctuations of a time-reversal-symmetric intervalley coherent order motivated by recent experiments. Consequently, band-off-diagonal superconductivity allows for the reconciliation of several key experimental observations in graphene moiré systems.

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Quantum textures of the many-body wavefunctions in magic-angle graphene

Cited by 52 publications

References 41 publications

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

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

Resolving exotic quantum states using scanning tunneling microscopy

Nodal band-off-diagonal superconductivity in twisted graphene superlattices

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