# Tunable quantum interferometer for correlated moiré electrons

https://mdr.nims.go.jp/datasets/f9c37fc5-5691-4a6b-8ec6-6a8e347b1834

## File

- [s41467-023-44671-4.pdf](https://mdr.nims.go.jp/filesets/760d38c8-6d40-4240-b41e-e452db38c453/download) ([Detail](https://mdr.nims.go.jp/filesets/760d38c8-6d40-4240-b41e-e452db38c453.md))

## Id

f9c37fc5-5691-4a6b-8ec6-6a8e347b1834

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-14T07:33:19.778303Z

## Updated at

2025-02-15T03:30:51.552475Z

## Published at

2025-02-15T03:30:51.721329Z

## Doi



## First published url

https://doi.org/10.1038/s41467-023-44671-4

## Date published

2024-01-09

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Tunable quantum interferometer for correlated moiré electrons
  title_type: original
  lang: en

## Description

- description: Magic-angle twisted bilayer graphene (MATBG) can host an intriguing
    variety of gate-tunable correlated states, including su- perconducting and correlated-insulator
    states. Junction-based superconducting devices, such as Josephson junctions and
    SQUIDs, have been introduced recently and enable the exploration of the charge,
    spin, and orbit nature of su- perconductivity and the coherence of moir ́e electrons
    in MATBG. However, complementary fundamental coherence effects — in particular,
    the Little–Parks effect in superconducting and the Aharonov–Bohm effect in normal-conducting
    ring — remained to be observed. Here, we report the observation of both these
    phenomena in a sin- gle gate-defined ring device where we can embed superconducting
    or normal-conducting rings in a correlated or band insulator. We directly observe
    the Little–Parks effect in the superconducting phase diagram as a function of
    density and magnetic field, confirming the effective charge of 2e. By measuring
    the Aharonov–Bohm effect, we find that in our device, the coherence length of
    normal-conducting moir ́e electrons exceeds a few microns at 50 mK. Surprisingly,
    we also identify a regime characterized by h/e-periodic oscilla- tions but with
    superconductor-like nonlinear transport. Taken together, these experiments establish
    a novel device platform in MATBG, and more generally in tunable 2D materials,
    to un- ravel the nature of superconductivity and other correlated quantum states
    in these materials.
  description_type: abstract
  lang: und

## Creator

- name: Shuichi Iwakiri
  role: author
- name: Alexandra Mestre-Torà
  role: author
- name: Elías Portolés
  role: author
- name: Marieke Visscher
  role: author
- name: Marta Perego
  role: author
- name: Giulia Zheng
  role: author
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Manfred Sigrist
  role: author
- name: Thomas Ihn
  role: author
- name: Klaus Ensslin
  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: superconducting states
  schema: not_defined
- subject: Little–Parks effect
  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: '15'
  issue: '1'
  article_number: '390'

## Conference



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## Instrument



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 760d38c8-6d40-4240-b41e-e452db38c453
  filename: s41467-023-44671-4.pdf
  content_type: application/pdf
  size: 1733894
  md5: 8c644680bcb0f756147d8cf7e868eb9b

## Thumbnail

fileset_id: 760d38c8-6d40-4240-b41e-e452db38c453
filename: s41467-023-44671-4.pdf