# Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene

https://mdr.nims.go.jp/datasets/4196236e-390e-4d7d-a6ed-4cfc7872383d

## File

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## Id

4196236e-390e-4d7d-a6ed-4cfc7872383d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-26T04:25:12.656714Z

## Updated at

2025-02-26T23:30:43.200955Z

## Published at

2025-02-26T23:30:43.312003Z

## Doi



## First published url

https://doi.org/10.1038/s41467-023-38005-7

## Date published

2023-04-26

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Symmetry-broken Josephson junctions and superconducting diodes in magic-angle
    twisted bilayer graphene
  title_type: original
  lang: en

## Description

- description: The simultaneous co-existence and gate-tuneability of the superconducting
    (SC), magnetic and topological orders in magic angle twisted bilayer graphene
    (MATBG) open up entirely new possibilities for the creation of complex hybrid
    Josephson junctions (JJ). Here we report on the creation of gate-defined, magnetic
    Josephson junctions in MATBG, where the weak link is gate-tuned close to the correlated
    state at a moiré filling factor of ν=-2. A highly unconventional Fraunhofer pattern
    emerges, which is phase-shifted and asymmetric with respect to the current and
    magnetic field directions, and shows a pronounced magnetic hysteresis. Interestingly,
    our theoretical calculations of the JJ with a valley polarized ν=-2 with orbital
    magnetization as the weak link explain most of these unconventional features without
    fine tuning the parameters. While these unconventional Josephson effects persist
    up to the critical temperature Tc ~ 3.5K of the superconducting state, at temperatures
    below T < 800mK, we observed a pronounced magnetic hysteresis possibly due to
    further spin-polarization of the ν=-2 state. We demonstrate how the combination
    of magnetization and its current induced magnetization switching in the MATBG
    JJ allows us to realize a programmable zero field superconducting diode, which
    represents a major building block for a new generation of superconducting quantum
    electronics.
  description_type: abstract
  lang: und

## Creator

- name: J. Díez-Mérida
  role: author
- name: A. Díez-Carlón
  role: author
- name: S. Y. Yang
  role: author
- name: Y.-M. Xie
  role: author
- name: X.-J. Gao
  role: author
- name: J. Senior
  role: author
- name: K. Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
- name: T. Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
- name: X. Lu
  role: author
- name: A. P. Higginbotham
  role: author
- name: K. T. Law
  role: author
- name: Dmitri K. Efetov
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Gate-tunable superconducting
  schema: not_defined
- subject: Josephson junctions
  schema: not_defined
- subject: magnetic hysteresis
  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: '2396'

## Conference



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## Instrument



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## Measurement method



## Specimen



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## Fileset

- id: 6d018755-e31b-4c1b-a25c-6824f444afc0
  filename: s41467-023-38005-7.pdf
  content_type: application/pdf
  size: 1405588
  md5: a778105665c10beb2354c92d2b295115

## Thumbnail

fileset_id: 6d018755-e31b-4c1b-a25c-6824f444afc0
filename: s41467-023-38005-7.pdf