# Spin skyrmion gaps as signatures of strong-coupling insulators in magic-angle twisted bilayer graphene

https://mdr.nims.go.jp/datasets/6459d56d-961f-4bb6-9756-c54bc64189a3

## File

- [s41467-023-42275-6.pdf](https://mdr.nims.go.jp/filesets/ac3dc4b8-542f-4946-ae8a-ed044b46755b/download) ([Detail](https://mdr.nims.go.jp/filesets/ac3dc4b8-542f-4946-ae8a-ed044b46755b.md))

## Id

6459d56d-961f-4bb6-9756-c54bc64189a3

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-14T07:49:30.470276Z

## Updated at

2025-02-15T03:31:04.571433Z

## Published at

2025-02-15T03:31:04.709063Z

## Doi



## First published url

https://doi.org/10.1038/s41467-023-42275-6

## Date published

2023-10-21

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Spin skyrmion gaps as signatures of strong-coupling insulators in magic-angle
    twisted bilayer graphene
  title_type: original
  lang: en

## Description

- description: The flat electronic bands in magic-angle twisted bilayer graphene (MATBG)
    host a variety of correlated insulating ground states, many of which are predicted
    to support charged excitations with topologically non-trivial spin and/or valley
    skyrmion textures. However, it has remained challenging to experimentally address
    their ground state order and excitations, both because some of the proposed states
    do not couple directly to experimental probes, and because they are highly sensitive
    to spatial inhomogeneities in real samples. Here, using a scanning single-electron
    transistor, we observe thermodynamic gaps at even integer moiré filling factors
    at low magnetic fields. We find evidence of a field-tuned crossover from charged
    spin skyrmions to bare particle-like excitations, and use this to establish that
    the underlying ground state is a Kramers intervalley-coherent insulator. From
    the spatial dependence of these states and the chemical potential variation within
    the flat bands, we infer a link between the stability of the correlated ground
    states and local twist angle and strain. Our work advances the microscopic understanding
    of the correlated insulators in MATBG and their unconventional excitations, giving
    insight into the potential mechanisms by which they seed superconductivity upon
    doping.
  description_type: abstract
  lang: und

## Creator

- name: Jiachen Yu
  role: author
- name: Benjamin A. Foutty
  role: author
- name: Yves H. Kwan
  role: author
- name: Mark E. Barber
  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: Zhi-Xun Shen
  role: author
- name: Siddharth A. Parameswaran
  role: author
- name: Benjamin E. Feldman
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Magic-angle twisted bilayer graphene
  schema: not_defined
- subject: correlated insulating states
  schema: not_defined
- subject: spin skyrmions
  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: '14'
  issue: '1'
  article_number: '6679'

## Conference



## Related item



## Funding

- identifier: DE-SC0021238
  funder_name: U.S. Department of Energy
- funder_name: Alfred P. Sloan Foundation
- funder_name: Stanford Unversity Terman Fellowship

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## Fileset

- id: ac3dc4b8-542f-4946-ae8a-ed044b46755b
  filename: s41467-023-42275-6.pdf
  content_type: application/pdf
  size: 2102208
  md5: 50ae22ecf9c0ccd9b3f830e230e1074b

## Thumbnail

fileset_id: ac3dc4b8-542f-4946-ae8a-ed044b46755b
filename: s41467-023-42275-6.pdf