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

https://mdr.nims.go.jp/datasets/ecce1a76-2de5-42a1-bb76-7f290f494fee

## File

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## Id

ecce1a76-2de5-42a1-bb76-7f290f494fee

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-07T04:08:43.961205Z

## Updated at

2025-02-07T07:30:33.413653Z

## Published at

2025-02-07T07:30:33.507473Z

## Doi



## First published url

https://doi.org/10.1038/s41467-024-48385-z

## Date published

2024-05-21

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Uncovering the spin ordering in magic-angle graphene via edge state equilibration
  title_type: original
  lang: en

## Description

- description: Determining the symmetry breaking order of correlated quantum phases
    is essential for under- standing the microscopic interactions in their host systems.
    The flat bands in magic-angle twisted bilayer graphene (MATBG) provide an especially
    rich arena to investigate such interaction- driven ground states, and while progress
    has been made in identifying the correlated insulators and their excitations at
    commensurate moir ́e filling factors, the spin-valley polarization of the Chern
    insulators that emerge at high fields remains unknown. Here we intro- duce a new
    technique based on twist-decoupled van der Waals layers that enables measurements
    of their chemical potentials and, by studying the backscattering between counter-propagating
    edge states, determination of their relative spin polarization. Applying this
    method to twist-decoupled MATBG and monolayer graphene, we find that the quantum
    Hall states near the charge neutrality point in MATBG favor spin-unpolarized states
    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,
    but suggest that its conduction band counterpart may be spin-polarized. Our results
    constrain models of spin-valley ordering in MATBG and establish a versatile approach
    to study the electronic properties of van der Waals systems.
  description_type: abstract
  lang: und

## Creator

- name: Jesse C. Hoke
  role: author
- name: Yifan Li
  role: author
- name: Julian May-Mann
  role: author
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Barry Bradlyn
  role: author
- name: Taylor L. Hughes
  role: author
- name: Benjamin E. Feldman
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Magic-angle twisted bilayer graphene
  schema: not_defined
- subject: spin-valley polarizations
  schema: not_defined
- subject: quantum Hall states
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Nature Communications
  issn: '20411723'
  volume: '15'
  issue: '1'
  article_number: '4321'

## Conference



## Related item



## Funding

- identifier: DE-SC0021238
  funder_name: U.S. Department of Energy

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Process for specimen treatment



## Computational method



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## Fileset

- id: 9745cbec-254f-47bb-9637-5c1f22521552
  filename: s41467-024-48385-z.pdf
  content_type: application/pdf
  size: 1607661
  md5: ee30765f7005dbccdc68e53ba7c64373

## Thumbnail

fileset_id: 9745cbec-254f-47bb-9637-5c1f22521552
filename: s41467-024-48385-z.pdf