# Evidence of compensated semimetal with electronic correlations at charge neutrality of twisted double bilayer graphene

https://mdr.nims.go.jp/datasets/c2df4eac-856c-46e5-b9e5-9016870a01f2

## File

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## Id

c2df4eac-856c-46e5-b9e5-9016870a01f2

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-25T05:34:43.398241Z

## Updated at

2025-02-26T03:30:33.773607Z

## Published at

2025-02-26T03:30:33.882667Z

## Doi



## First published url

https://doi.org/10.1038/s42005-023-01480-x

## Date published

2023-12-16

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Evidence of compensated semimetal with electronic correlations at charge
    neutrality of twisted double bilayer graphene
  title_type: original
  lang: en

## Description

- description: Recently, magic-angle twisted bilayer graphene (MATBLG) has shown the
    emergence of various interaction-driven novel quantum phases at the commensurate
    fillings of the moire ́ superlattice, while the charge neutrality point (CNP)
    remains mostly a vanilla insulator. Here, we show an emerging phase of nearly
    compensated semimetallicity at the CNP of twisted double bilayer graphene (TDBLG),
    a close cousin of MATBLG, with a signature of strong correlation. Using electrical
    and thermal transport, we find almost two orders of magnitude enhancement of the
    thermopower in magnetic fields much smaller than the extreme quantum limit, accompanied
    by a large magnetore- sistance (∼ 2500%) at CNP. This provides indisputable experimental
    evidence that TDBLG near CNP is a compensated semimetal. Moreover, we observe
    a two-peak structure in the resistance variation with carrier density around the
    CNP and its unusual sublinear temperature dependence at low temperatures. The
    electronic correlations determine the fate of the co-existing small electron and
    hole pockets near the CNP of the semimetallic TDBLG. Our theory with the formation
    of excitonic metal explains the resistance feature and its unique sublinear temperature
    dependence.
  description_type: abstract
  lang: und

## Creator

- name: Ayan Ghosh
  role: author
- name: Souvik Chakraborty
  role: author
- name: Unmesh Ghorai
  role: author
- name: Arup Kumar Paul
  role: author
- name: K. Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: T. Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Rajdeep Sensarma
  role: author
- name: Anindya Das
  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: compensated semimetallicity
  schema: not_defined
- subject: electronic correlation
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Communications Physics
  issn: '23993650'
  volume: '6'
  issue: '1'
  article_number: '360'

## Conference



## Related item



## Funding

- funder_name: Department of Science and Technology, Ministry of Science and Technology
- funder_name: DST | Science and Engineering Research Board

## Instrument



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## Instrument managing organization



## Measurement method



## Specimen



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## Fileset

- id: 06f8ad9c-e45f-491c-b259-667e04aecc92
  filename: s42005-023-01480-x.pdf
  content_type: application/pdf
  size: 3951118
  md5: 6947efb6fb77e639c6bfe21ddb341636

## Thumbnail

fileset_id: 06f8ad9c-e45f-491c-b259-667e04aecc92
filename: s42005-023-01480-x.pdf