# Strongly coupled magneto-exciton condensates in large-angle twisted double bilayer graphene

https://mdr.nims.go.jp/datasets/4c6cc3a5-8195-4c15-8abb-293c06928aae

## File

- [s41467-024-49406-7.pdf](https://mdr.nims.go.jp/filesets/724fd5a5-df6f-456a-af5f-8772913715d0/download) ([Detail](https://mdr.nims.go.jp/filesets/724fd5a5-df6f-456a-af5f-8772913715d0.md))

## Id

4c6cc3a5-8195-4c15-8abb-293c06928aae

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-07T02:02:27.685046Z

## Updated at

2025-02-07T07:30:21.033233Z

## Published at

2025-02-07T07:30:22.261334Z

## Doi



## First published url

https://doi.org/10.1038/s41467-024-49406-7

## Date published

2024-06-13

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Strongly coupled magneto-exciton condensates in large-angle twisted double
    bilayer graphene
  title_type: original
  lang: en

## Description

- description: Excitons, the bosonic quasiparticle emerging from Coulomb interaction
    between electrons and holes, will undergo a Bose-Einstein condensa- tion(BEC)
    and transition into a superfluid state with global phase coherence at low tempera-
    tures. An important platform to study such excitonic physics is built on double-layer
    quan- tum wells or recent two-dimensional material het- erostructures, where two
    parallel planes of elec- trons and holes are separated by a thin insu- lating
    layer. Lowering this separation distance (d) enhances the interlayer Coulomb interaction
    thereby strengthens the exciton binding energy. However, an exceedingly small
    d will lead to the undesired interlayer tunneling, which results the annihilation
    of excitons. Here, we report the ob- servation of a sequences of robust exciton
    conden- sates(ECs) in double bilayer graphenes twisted to ∼10◦ with no insulating
    mid-layer. The large momentum mismatch between the two graphene layers well suppress
    the interlayer tunneling, al- lowing us to reach the separation lower limit ∼
    0.334 nm and investigate ECs in the extreme cou- pling regime. Carrying out transport
    measure- ments on the bulk and edge of the devices, we find incompressible states
    corresponding to ECs when both layers are half-filled in the N = 0 and N = 1 Landau
    levels (LLs). The comparison between these ECs and theoretical calculations suggest
    that the low-energy charged excitation of ECs can be meron-antimeron or particle-hole
    pair, which relies on both LL index and carrier type. Our results establish large-angle
    twisted bi- layers as an experimental platform with extreme coupling strength
    for studying quantum bosonic phase and its low-energy excitations.
  description_type: abstract
  lang: und

## Creator

- name: Qingxin Li
  role: author
- name: Yiwei Chen
  role: author
- name: LingNan Wei
  role: author
- name: Hong Chen
  role: author
- name: Yan Huang
  role: author
- name: Yujian Zhu
  role: author
- name: Wang Zhu
  role: author
- name: Dongdong An
  role: author
- name: Junwei Song
  role: author
- name: Qikang Gan
  role: author
- name: Qi Zhang
  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: Xiaoyang Shi
  role: author
- name: Kostya S. Novoselov
  role: author
- name: Rui Wang
  role: author
- name: Geliang Yu
  role: author
- name: Lei Wang
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Excitons
  schema: not_defined
- subject: Bose-Einstein condensation
  schema: not_defined
- subject: double bilayer graphene
  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: '5065'

## Conference



## Related item



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## Instrument



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## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 724fd5a5-df6f-456a-af5f-8772913715d0
  filename: s41467-024-49406-7.pdf
  content_type: application/pdf
  size: 1920919
  md5: b01678365378c7c9818dc8fe4d856508

## Thumbnail

fileset_id: 724fd5a5-df6f-456a-af5f-8772913715d0
filename: s41467-024-49406-7.pdf