# Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene

https://mdr.nims.go.jp/datasets/1d43c86f-379d-4809-8ca5-3a9625839a6b

## File

- [s41467-022-34192-x.pdf](https://mdr.nims.go.jp/filesets/36da04af-5b10-4523-8e82-66717030a66a/download) ([Detail](https://mdr.nims.go.jp/filesets/36da04af-5b10-4523-8e82-66717030a66a.md))

## Id

1d43c86f-379d-4809-8ca5-3a9625839a6b

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-26T04:56:30.728740Z

## Updated at

2025-02-26T23:31:02.273280Z

## Published at

2025-02-26T23:31:02.380527Z

## Doi



## First published url

https://doi.org/10.1038/s41467-022-34192-x

## Date published

2022-10-29

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene
  title_type: original
  lang: en

## Description

- description: Twisted double bilayer graphene (tDBG) comprises two Bernal-stacked
    bilayer graphene sheets with a twist between them. Gate voltages applied to top
    and back gates of a tDBG device tune both the flatness and topology of the electronic
    bands, enabling an unusual level of experimental control. Broken spin/valley symmetry
    metallic states have been observed in tDBG devices with twist angles ∼ 1.2-1.3◦,
    but the topologies and order parameters of these states have remained unclear.
    We report the observation of an anomalous Hall effect in the correlated metal
    state of tDBG, with hysteresis loops spanning 100s of mT in out-of-plane magnetic
    field that demonstrate spontaneously broken time-reversal symmetry. The B⊥ hysteresis
    persists for in-plane fields up to several Tesla, suggesting valley (orbital)
    ferromagnetism. At the same time, the resistivity is strongly affected by even
    mT-scale values of in-plane magnetic field, pointing to spin-valley coupling or
    to a direct orbital coupling between in-plane field and valley symmetry.
  description_type: abstract
  lang: und

## Creator

- name: Manabendra Kuiri
  role: author
- name: Christopher Coleman
  role: author
- name: Zhenxiang Gao
  role: author
- name: Aswin Vishnuradhan
  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: Jihang Zhu
  role: author
- name: Allan H. MacDonald
  role: author
- name: Joshua Folk
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: wisted double bilayer graphene
  schema: not_defined
- subject: anomalous Hall effect
  schema: not_defined
- subject: ferromagnetism
  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: '6468'

## Conference



## Related item



## Funding

- funder_name: Canada Foundation for Innovation
- funder_name: Gouvernement du Canada | Natural Sciences and Engineering Research
    Council of Canada

## 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



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: 36da04af-5b10-4523-8e82-66717030a66a
  filename: s41467-022-34192-x.pdf
  content_type: application/pdf
  size: 2091917
  md5: 362c864b1fac3308437069767b95cb81

## Thumbnail

fileset_id: 36da04af-5b10-4523-8e82-66717030a66a
filename: s41467-022-34192-x.pdf