# Revealing flat bands and hybridization gaps in a twisted bilayer graphene device with microARPES

https://mdr.nims.go.jp/datasets/7b11a652-68bb-4240-ad81-4fbfd055fe7f

## File

- [Jiang_2023_2D_Mater._10_045027.pdf](https://mdr.nims.go.jp/filesets/da644217-6970-4663-b089-786bc2a71388/download) ([Detail](https://mdr.nims.go.jp/filesets/da644217-6970-4663-b089-786bc2a71388.md))

## Id

7b11a652-68bb-4240-ad81-4fbfd055fe7f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-13T06:13:28.528868Z

## Updated at

2025-02-14T03:30:34.258287Z

## Published at

2025-02-14T03:30:34.362924Z

## Doi



## First published url

https://doi.org/10.1088/2053-1583/acf775

## Date published

2023-10-01

## Recorded date published

2023-10-1

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Revealing flat bands and hybridization gaps in a twisted bilayer graphene
    device with microARPES
  title_type: original
  lang: en

## Description

- description: Controlling the electronic structure of two-dimensional materials using
    the combination of twist angle and electrostatic doping is an effective means
    to induce emergent phenomena. In bilayer graphene with an interlayer twist angle
    near the magic angle, the electronic dispersion is strongly modified by a manifold
    of hybridizing moiré Dirac cones leading to flat band segments with strong electronic
    correlations. Numerous technical challenges arising from spatial inhomogeneity
    of interlayer interactions, twist angle and device functionality have so far limited
    momentum-resolved electronic structure measurements of these systems to static
    conditions. Here, we present a detailed characterization of the electronic structure
    exhibiting miniband dispersions for twisted bilayer graphene, near the magic angle,
    integrated in a functional device architecture using micro-focused angle-resolved
    photoemission spectroscopy. The optimum conditions for visualizing the miniband
    dispersion are determined by exploiting the spatial resolution and photon energy
    tunability of the light source and applied to extract a hybridization gap size
    of (0.14 ± 0.03) eV and flat band segments extending across a moiré mini Brillouin
    zone. In situ electrostatic gating of the sample enables significant electron-doping,
    causing the conduction band states to shift below the Fermi energy. Our work emphasizes
    key challenges in probing the electronic structure of magic angle bilayer graphene
    devices and outlines conditions for exploring the doping-dependent evolution of
    the dispersion that underpins the ability to control many-body interactions in
    the material.
  description_type: abstract
  lang: und

## Creator

- name: Zhihao Jiang
  role: author
- name: Kimberly Hsieh
  role: author
- name: Alfred J H Jones
  role: author
- name: Paulina Majchrzak
  role: author
- name: Chakradhar Sahoo
  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: Jill A Miwa
  role: author
- name: Yong P Chen
  role: author
- name: Søren Ulstrup
  role: author

## Contact agent



## Publisher

organization: IOP Publishing

## Managing organization



## Keyword

- subject: Twisted bilayer graphene
  schema: not_defined
- subject: electrostatic doping
  schema: not_defined
- subject: miniband dispersions
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: 2D Materials
  issn: '20531583'
  volume: '10'
  issue: '4'
  article_number: '045027'

## Conference



## Related item



## Funding

- funder_name: JSPS
- identifier: '25931'
  funder_name: Villum Investigator Program
- funder_name: World Premier International Research Center Initiative (WPI), MEXT,
    Japan
- identifier: 20H00354
  funder_name: KAKENHI
- identifier: DFF-9064-00057B
  funder_name: Danish Council for Independent Research
- identifier: DFF-6108-00409
  funder_name: Natur og Univers, Det Frie Forskningsråd
- funder_name: Villum Fonden
- identifier: NNF22OC0079960
  funder_name: Novo Nordisk

## Instrument



## Instrument operator



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Computational method



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## Fileset

- id: da644217-6970-4663-b089-786bc2a71388
  filename: Jiang_2023_2D_Mater._10_045027.pdf
  content_type: application/pdf
  size: 1726346
  md5: deb2748ac69226e2a690a7a214a2e909

## Thumbnail

fileset_id: da644217-6970-4663-b089-786bc2a71388
filename: Jiang_2023_2D_Mater._10_045027.pdf