# ac Stark Spectroscopy of Interactions between Moiré Excitons and Polarons

https://mdr.nims.go.jp/datasets/6a7c4599-b190-4f39-afd2-0a346886aa2d

## File

- [PhysRevX.15.021002.pdf](https://mdr.nims.go.jp/filesets/405d20c0-f914-438c-a62b-36e2f2071706/download) ([Detail](https://mdr.nims.go.jp/filesets/405d20c0-f914-438c-a62b-36e2f2071706.md))

## Id

6a7c4599-b190-4f39-afd2-0a346886aa2d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-02-14T06:20:12.730677Z

## Updated at

2026-02-16T07:30:31.245382Z

## Published at

2026-02-16T04:57:31.102616Z

## Doi



## First published url

https://doi.org/10.1103/physrevx.15.021002

## Date published

2025-04-01

## Recorded date published

2025-4

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: ac Stark Spectroscopy of Interactions between Moiré Excitons and Polarons
  title_type: original
  lang: en

## Description

- description: We use time-resolved nonlinear pump–probe measurements to reveal features
    of semiconductor moiré materials not accessible to linear spectroscopy. With an
    intense, red-detuned pump pulse, we generate a high density of virtual excitons
    or exciton–polarons in various moiré minibands. A broadband probe pulse in turn
    measures the response of all optical resonances induced by the pump-generated
    excitations. We generically observe a coherent blue shift originating from contact-
    like exciton–exciton interactions. At charge neutrality, these measurements allow
    us to assess the spatial overlap between different optical excitations and to
    observe signatures of a bound biexciton state between two different moiré exciton
    modes. In contrast to electron doped monolayers, spatially confined moiré attractive
    polarons behave as an ensemble of non-interacting two-level emitters, exhibiting
    an electron-density-independent ac-Stark effect. Tuning the pump laser into resonance
    with the attractive polaron, we demonstrate the filling of the moiré lattice with
    localized polarons and thereby realize a nonequilibrium Bose–Fermi mixture in
    moiré flat bands.
  description_type: abstract
  lang: und

## Creator

- name: B. Evrard
  role: author
- name: H. S. Adlong
  role: author
- name: A. A. Ghita
  role: author
- name: T. Uto
  role: author
- name: L. Ciorciaro
  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: M. Kroner
  role: author
- name: A. İmamoğlu
  role: author

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: ac Stark spectroscopy
  schema: not_defined
- subject: 'moiré excitons
    '
  schema: not_defined
- subject: 'polarons
    '
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2025-04-01

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Physical Review X
  issn: '21603308'
  volume: '15'
  issue: '2'
  article_number: '021002'

## Conference



## Related item



## Funding

- identifier: '200020_207520'
  funder_name: Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen
    Forschung

## Instrument



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## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 405d20c0-f914-438c-a62b-36e2f2071706
  filename: PhysRevX.15.021002.pdf
  content_type: application/pdf
  size: 2264550
  md5: dee100ca8b0a03ea88ca2c968a78fb7e

## Thumbnail

fileset_id: 405d20c0-f914-438c-a62b-36e2f2071706
filename: PhysRevX.15.021002.pdf