# Interplay between light and heavy electron bands in magic-angle twisted bilayer graphene

https://mdr.nims.go.jp/datasets/0e7a83d8-6d27-4f34-b3a4-b7d06305e212

## File

- [s41567-025-02912-x.pdf](https://mdr.nims.go.jp/filesets/b664ced9-c586-4f6d-9c6e-955e3173becf/download) ([Detail](https://mdr.nims.go.jp/filesets/b664ced9-c586-4f6d-9c6e-955e3173becf.md))

## Id

0e7a83d8-6d27-4f34-b3a4-b7d06305e212

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-03-08T04:38:21.274619Z

## Updated at

2026-03-09T00:30:23.095574Z

## Published at

2026-03-09T03:27:45.092676Z

## Doi



## First published url

https://doi.org/10.1038/s41567-025-02912-x

## Date published

2025-05-22

## Recorded date published

2025-7

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Interplay between light and heavy electron bands in magic-angle twisted bilayer
    graphene
  title_type: original
  lang: en

## Description

- description: It has been recently postulated, that the strongly correlated flat
    bands of magicangle twisted bilayer graphene (MATBG) can host coexisting heavy
    and light carriers. While transport and spectroscopic measurements have shown
    hints of this behavior, a more direct experimental proof is still lacking. Here,
    we explore the thermoelectric response of MATBG through the photo-thermoelectric
    (PTE) effect in gate-defined MATBG pn-junctions. At low temperatures, we observe
    sign-preserving, fillingdependent oscillations of the Seebeck coefficient at non-zero
    integer fillings of the moiré lattice, which suggest the preponderance of one
    carrier type despite tuning the Fermi level from hole to electron doping of the
    correlated insulator. Furthermore, at higher temperatures, the thermoelectric
    response provides distinct evidence of the strong electron correlations in the
    unordered, normal state. We show that our observations are naturally accounted
    for by the interplay of light and long-lived and heavy and short-lived electron
    bands near the Fermi level at non-zero integer fillings. Our observations firmly
    establish the electron and hole asymmetry of the correlated gaps in MATBG, and
    shows excellent qualitative agreement with the recently developed topological
    heavy fermion model (THF).
  description_type: abstract
  lang: und

## Creator

- name: Rafael Luque Merino
  role: author
- name: Dumitru Călugăru
  role: author
- name: Haoyu Hu
  role: author
- name: Jaime Díez-Mérida
  role: author
- name: Andrés Díez-Carlón
  role: author
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
- name: Paul Seifert
  role: author
- name: B. Andrei Bernevig
  role: author
- name: Dmitri K. Efetov
  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: thermoelectric transport
  schema: not_defined
- subject: heavy fermions
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2025-05-22

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Nature Physics
  issn: '17452481'
  volume: '21'
  issue: '7'
  start_page: 1078
  end_page: 1084

## Conference



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## Instrument



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: b664ced9-c586-4f6d-9c6e-955e3173becf
  filename: s41567-025-02912-x.pdf
  content_type: application/pdf
  size: 1528368
  md5: 238d4ac53d7d5dc9a400bdb1e517d997

## Thumbnail

fileset_id: b664ced9-c586-4f6d-9c6e-955e3173becf
filename: s41567-025-02912-x.pdf