# Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene

https://mdr.nims.go.jp/datasets/6d958197-935f-4a44-b8c2-408866c1d1cd

## Files

- [s41467-024-48166-8.pdf](https://mdr.nims.go.jp/filesets/a581c9f4-35aa-4ed1-bf0b-224396653334/download) ([Detail](https://mdr.nims.go.jp/filesets/a581c9f4-35aa-4ed1-bf0b-224396653334.md))

## Id

6d958197-935f-4a44-b8c2-408866c1d1cd

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-26T06:37:37.915056Z

## Updated at

2025-02-27T03:30:45.385505Z

## Published at

2025-02-27T03:30:45.481436Z

## Doi



## First published url

https://doi.org/10.1038/s41467-024-48166-8

## Date published

2024-05-03

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer
    graphene
  title_type: original
  lang: en

## Description

- description: Twisted bilayer graphene (tBLG) provides a fascinating platform for
    engineering flat bands and inducing correlated phenomena. By increasing the number
    of stacked graphene layers, twisted multilayer graphene can exhibit different
    symmetries with rich tunabilities. For example, for twisted monolayer-bilayer
    graphene (tMBG) which breaks the C2z symmetry, transport measurements reveal an
    asymmetric phase diagram under an out-of-plane electric field, exhibiting correlated
    insulating state and ferromagnetic state respectively when reversing the field
    direction. Revealing the electronic structure evolution with electric field is
    critical for understanding such asymmetric field tunable properties. Here we report
    the experimental observation of dichotomic electronic structure response of tMBG
    to bias voltage by nanospot angle-resolved photoemission spectroscopy (NanoARPES)
    with operando gating. Spectral weight contributions from monolayer and bilayer
    graphene are selectively enhanced by switching the bias voltage, and dispersive
    bands similar to tBLG are observed under positive bias voltage (electric field
    pointing from monolayer to bilayer graphene), while in contrast, more pronounced
    flat bands resembling those in twisted double bilayer graphene (tDBG) are observed
    under negative bias voltage. Combing experimental results with theo- retical calculations,
    the origin of such field tunable electronic structure is attributed to the field
    induced population of carriers into different stacked graphene layers with enhanced
    electron-hole asymmetry dictated by the asymmetric stacking. Our work provides
    electronic structure insights for understanding the rich field-tunable physics
    of tMBG.
  description_type: abstract
  lang: und

## Creator

- name: Hongyun Zhang
  role: author
- name: Qian Li
  role: author
- name: Youngju Park
  role: author
- name: Yujin Jia
  role: author
- name: Wanying Chen
  role: author
- name: Jiaheng Li
  role: author
- name: Qinxin Liu
  role: author
- name: Changhua Bao
  role: author
- name: Nicolas Leconte
  role: author
- name: Shaohua Zhou
  role: author
- name: Yuan Wang
  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: Jose Avila
  role: author
- name: Pavel Dudin
  role: author
- name: Pu Yu
  role: author
- name: Hongming Weng
  role: author
- name: Wenhui Duan
  role: author
- name: Quansheng Wu
  role: author
- name: Jeil Jung
  role: author
- name: Shuyun Zhou
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Twisted bilayer graphene
  schema: not_defined
- subject: flat bands
  schema: not_defined
- subject: field-tunable properties
  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: '3737'

## Conference



## Related item



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## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Computational method



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## Fileset

- id: a581c9f4-35aa-4ed1-bf0b-224396653334
  filename: s41467-024-48166-8.pdf
  content_type: application/pdf
  size: 2613058
  md5: 7c93de33ef41fd802c7565a04bfcbf9f

## Thumbnail

fileset_id: a581c9f4-35aa-4ed1-bf0b-224396653334
filename: s41467-024-48166-8.pdf