# Correlated insulating and superconducting states in twisted bilayer graphene below the magic angle

https://mdr.nims.go.jp/datasets/604faf9e-c26e-42f3-86b2-a4a37a94727c

## File

- [eaaw9770.full.pdf](https://mdr.nims.go.jp/filesets/4278d92d-f2a7-465c-a3f8-3e13df54d9d2/download) ([Detail](https://mdr.nims.go.jp/filesets/4278d92d-f2a7-465c-a3f8-3e13df54d9d2.md))

## Id

604faf9e-c26e-42f3-86b2-a4a37a94727c

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-20T06:52:47.985810Z

## Updated at

2025-02-23T13:50:59.941983Z

## Published at

2025-02-23T13:51:00.057700Z

## Doi



## First published url

https://doi.org/10.1126/sciadv.aaw9770

## Date published

2019-09-06

## Recorded date published

2019-9-6

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Correlated insulating and superconducting states in twisted bilayer graphene
    below the magic angle
  title_type: original
  lang: en

## Description

- description: The emergence of flat bands and correlated behaviors in “magic angle”
    twisted bilayer graphene (tBLG) has sparked tremendous interest, though many aspects
    of the system are under intense debate. Here we report transport properties of
    a tBLG device that has a twist angle of ~0.93º and a moiré superlattice period
    of ~15 nm. Though the angle is smaller than the magic angle by 15%, the device
    displays both the Mott-like insulator at half filling and, at slightly larger
    doping, superconductivity with a critical temperature ~0.35 K. At an electron
    concentration of ±5 electrons/moiré unit cell, we observe a narrow resistance
    peak with varying temperature that results from an energy gap ~0.1 meV, indicating
    the existence of an additional correlated insulating state. This is consistent
    with theory predicting the presence of a high-energy band with an energetically
    flat dispersion. The Landau fans emanating from this state has degeneracy 10±2,
    indicating novel spin-valley ordering. At a doping of ±12 electrons/moiré unit
    cell we observe a resistance peak due to the presence of Dirac points in the spectrum.
    Our results reveal that the "magic" range of tBLG is in fact larger than what
    is commonly expected based on the current knowledge, and provide a wealth of new
    information to help decipher the strongly correlated phenomena observed in tBLG.
  description_type: abstract
  lang: und

## Creator

- name: Emilio Codecido
  role: author
- name: Qiyue Wang
  role: author
- name: Ryan Koester
  role: author
- name: Shi Che
  role: author
- name: Haidong Tian
  role: author
- name: Rui Lv
  role: author
- name: Son Tran
  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: Fan Zhang
  role: author
- name: Marc Bockrath
  role: author
- name: Chun Ning Lau
  role: author

## Contact agent



## Publisher

organization: American Association for the Advancement of Science (AAAS)

## Managing organization



## Keyword

- subject: Twisted bilayer graphene
  schema: not_defined
- subject: superconductivity
  schema: not_defined
- subject: Mott-like insulating state
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Science Advances
  issn: '23752548'
  volume: '5'
  issue: '9'

## Conference



## Related item



## Funding

- identifier: Elemental Strategy Initiative
  funder_name: MEXT
- identifier: DMR 1420451
  funder_name: National Science Foundation
- identifier: 46940-DE-SC0010597
  funder_name: U.S. Department of Energy
- identifier: W911NF-18-1-0416
  funder_name: Army Research Office

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Computational method



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## Fileset

- id: 4278d92d-f2a7-465c-a3f8-3e13df54d9d2
  filename: eaaw9770.full.pdf
  content_type: application/pdf
  size: 2108148
  md5: 53ca010e97c1eb09ec9dd17977e194c6

## Thumbnail

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filename: eaaw9770.full.pdf