# Observation of a Chern insulator in crystalline ABCA-tetralayer graphene with spin-orbit coupling

https://mdr.nims.go.jp/datasets/0d671714-7530-477a-8e82-52732e6c2e31

## Files

- [2024A00475G_Observation of a Chern insulator in crystalline ABCA tetralayer graphene with spin-orbit coupling.pdf](https://mdr.nims.go.jp/filesets/4ddfd3f9-fe5e-4519-8ae6-93dedea0c0ef/download) ([Detail](https://mdr.nims.go.jp/filesets/4ddfd3f9-fe5e-4519-8ae6-93dedea0c0ef.md))

## Id

0d671714-7530-477a-8e82-52732e6c2e31

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-07-18T05:14:45.249241Z

## Updated at

2025-07-18T07:30:26.837988Z

## Published at

2025-07-18T07:17:34.816479Z

## Doi



## First published url

https://doi.org/10.1126/science.adj8272

## Date published

2024-04-26

## Recorded date published

2024-4-26

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Observation of a Chern insulator in crystalline ABCA-tetralayer graphene
    with spin-orbit coupling
  title_type: original
  lang: en

## Description

- description: Degeneracies in multilayer graphene, including spin, valley, and layer
    degrees of freedom, can be lifted by Coulomb interactions, resulting in rich broken-symmetry
    states. Here, we report a ferromagnetic state in charge-neutral ABCA-tetralayer
    graphene driven by proximity-induced spin-orbit coupling from adjacent tungsten
    diselenide. The ferromagnetic state is identified as a Chern insulator with a
    Chern number of 4; its maximum Hall resistance reaches 78% quantization at zero
    magnetic field and is fully quantized at either 0.4 or –1.5 tesla. Three distinct
    broken-symmetry insulating states, layer-antiferromagnet, Chern insulator, and
    layer-polarized insulator, along with their transitions, can be continuously tuned
    by the vertical displacement field. In this system, the magnetic order of the
    Chern insulator can be switched by three knobs, including magnetic field, electrical
    doping, and vertical displacement field.
  description_type: abstract
  lang: en

## Creator

- name: Yating Sha
  role: author
- name: Jian Zheng
  role: author
- name: Kai Liu
  role: author
- name: Hong Du
  role: author
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
- name: Jinfeng Jia
  role: author
- name: Zhiwen Shi
  role: author
- name: Ruidan Zhong
  role: author
- name: Guorui Chen
  role: author

## Contact agent



## Publisher

organization: American Association for the Advancement of Science (AAAS)

## Managing organization



## Keyword

- subject: Chern insulator
  schema: not_defined
- subject: ABCA-tetralayer graphene
  schema: not_defined
- subject: ferromagnetic state
  schema: not_defined

## Rights

- description: 'This is the author’s version of the work. It is posted here by permission
    of the AAAS for personal use, not for redistribution. The definitive version was
    published in Science on Vol 384, 25 Apr 2024, DOI: 10.1126/science.adj8272.'
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Science
  issn: '10959203'
  volume: '384'
  issue: '6694'
  start_page: 414
  end_page: 419

## Conference



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## Measurement method



## Specimen



## Chemical composition



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## Fileset

- id: 4ddfd3f9-fe5e-4519-8ae6-93dedea0c0ef
  filename: 2024A00475G_Observation of a Chern insulator in crystalline ABCA tetralayer
    graphene with spin-orbit coupling.pdf
  content_type: application/pdf
  size: 708339
  md5: a89bce82f4f9675831f338a17456970e

## Thumbnail

fileset_id: 4ddfd3f9-fe5e-4519-8ae6-93dedea0c0ef
filename: 2024A00475G_Observation of a Chern insulator in crystalline ABCA tetralayer
  graphene with spin-orbit coupling.pdf