# Imaging topological and correlated insulating states in twisted monolayer-bilayer graphene

https://mdr.nims.go.jp/datasets/c1c631ed-2ae6-4bd0-abcc-0d268ad255c1

## File

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## Id

c1c631ed-2ae6-4bd0-abcc-0d268ad255c1

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-26T07:28:08.825868Z

## Updated at

2025-02-27T07:30:20.213409Z

## Published at

2025-02-27T07:30:20.426840Z

## Doi



## First published url

https://doi.org/10.1038/s41467-022-31851-x

## Date published

2022-07-22

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Imaging topological and correlated insulating states in twisted monolayer-bilayer
    graphene
  title_type: original
  lang: en

## Description

- description: Strong electron correlation and nontrivial band topology are two crucial
    strategies on exploring the novel quantum phases in condensed matter physics study1-5.
    When strong Coulomb correlations meets band topology together, exotic quantum
    phenomena are expected6,7. As one succeed example, the flat Chern bands with valley
    spin degeneracy can be globally split by strong Coulomb interactions, leading
    to various symmetry breaking states with topological nontrivial properties in
    twisted graphene systems8-10. Here, through a comprehensive spectrum study, for
    the first time we report an effective locking between strong local correlation
    effects and the intrinsic Chern bands in twisted mono-bilayer graphene near the
    magic angle. An intense competition between the local correlation physics that
    tries to halt the electrons motion and non-zero Chern number that obscures the
    electron localization generates intriguing electron freezing and Chern number
    fragmentation in real space. The strong Coulomb correlations give rise to an unusual
    charge localization within the moiré supercell, leading to a gate tunable electron
    crystal. It provides a new local mechanism on realizing the correlated insulating
    state at integer filling in moiré graphene systems. Moreover, the nontrivial band
    topology is encoded into the electron crystal, which would result in a topological
    mosaic, and is evidenced by an emergent topological order through direct spectrum
    images. It acts as a topological marker to visualize the Chern band in real space
    down to nanoscale without any request of external magnetic field. Our result illustrates
    an efficient strategy for entwining and engineering topological physics with a
    strong electron correlation.
  description_type: abstract
  lang: und

## Creator

- name: Si-yu Li
  role: author
- name: Zhengwen Wang
  role: author
- name: Yucheng Xue
  role: author
- name: Yingbo Wang
  role: author
- name: Shihao Zhang
  role: author
- name: Jianpeng Liu
  role: author
- name: Zheng Zhu
  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: Hong-jun Gao
  role: author
- name: Yuhang Jiang
  role: author
- name: Jinhai Mao
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Flat bands
  schema: not_defined
- subject: twisted monolayer-bilayer graphene
  schema: not_defined
- subject: electron crystal phase
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Nature Communications
  issn: '20411723'
  volume: '13'
  issue: '1'
  article_number: '4225'

## Conference



## Related item



## Funding

- identifier: '11974347'
  funder_name: National Natural Science Foundation of China
- identifier: '12074377'
  funder_name: National Natural Science Foundation of China

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



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## Custom property



## Fileset

- id: 5aac5d3a-99f0-4f0d-9dce-2f544730ede4
  filename: s41467-022-31851-x.pdf
  content_type: application/pdf
  size: 5939110
  md5: 39d0e06074fb351a99bf30aa6f72d895

## Thumbnail

fileset_id: 5aac5d3a-99f0-4f0d-9dce-2f544730ede4
filename: s41467-022-31851-x.pdf