# Dual Action Spectroscopy Exposes the Bright and Dark Excitons of Room-Temperature WSe<sub>2</sub>

https://mdr.nims.go.jp/datasets/864693db-bcd0-4d24-a2e4-941c70bd5c6d

## File

- [wragg-et-al-2025-dual-action-spectroscopy-exposes-the-bright-and-dark-excitons-of-room-temperature-wse2.pdf](https://mdr.nims.go.jp/filesets/b1254067-9595-481b-8f64-34ae5e29d8d2/download) ([Detail](https://mdr.nims.go.jp/filesets/b1254067-9595-481b-8f64-34ae5e29d8d2.md))

## Id

864693db-bcd0-4d24-a2e4-941c70bd5c6d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-02-14T11:55:10.948444Z

## Updated at

2026-02-16T23:30:29.586440Z

## Published at

2026-02-16T09:00:51.435072Z

## Doi



## First published url

https://doi.org/10.1021/acs.nanolett.4c06349

## Date published

2025-05-14

## Recorded date published

2025-5-14

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Dual Action Spectroscopy Exposes the Bright and Dark Excitons of Room-Temperature
    WSe<sub>2</sub>
  title_type: original
  lang: en

## Description

- description: While it’s long been accepted that the role of momentum dark excitons
    in the photoresponse of transition metal dichalcogenides (TMD’s) is critical,
    their weak optical signature has made any observation confined to cryogenic conditions.
    Here we surpass this limit, and expose the room temperature contributions of both
    bright and dark excitons to the behaviour of a TMD, WSe2, from monolayer to multilayer
    to bulk. To do so, we present dual action spectroscopy, a photocurrent and luminescence
    detected Fourier-transform excitation spectroscopy scheme to microscopically map
    the energy landscape of WSe2. While bright excitons naturally dominate the luminescence
    response of the material, dark excitons dominate the current response. Notably,
    the dark KK' exciton is more accessible than the ground state KΛ, while the current
    maps reveal a disparity in the diffusivity of the two states. This work provides
    the basis for a new current-detected approach to study the dynamics of dark exciton
    states across different materials.
  description_type: abstract
  lang: und

## Creator

- name: Joseph Wragg
  role: author
- name: Luca Bolzonello
  role: author
- name: Ludovica Donati
  role: author
- name: Karuppasamy Pandian Soundarapandian
  role: author
- name: Riccardo Bertini
  role: author
- name: Seth Ariel Tongay
  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: Frank H. L. Koppens
  role: author
- name: Niek F. van Hulst
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: 'dual action spectroscopy
    '
  schema: not_defined
- subject: 'bright and dark excitons
    '
  schema: not_defined
- subject: WSe2
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Nano Letters
  issn: '15306984'
  volume: '25'
  issue: '19'
  start_page: 7658
  end_page: 7664

## Conference



## Related item



## Funding

- funder_name: Fundaci?n Cellex
- identifier: '101054846'
  funder_name: European Research Council
- funder_name: FUNDACI? Privada MIR-PUIG
- identifier: CEX2019-000910-S
  funder_name: Ministerio de Ciencia, Innovaci?n y Universidades
- identifier: PID2021- 123814OB-I00
  funder_name: Ministerio de Ciencia, Innovaci?n y Universidades
- identifier: TED2021-129241BI00
  funder_name: Ministerio de Ciencia, Innovaci?n y Universidades
- funder_name: Generalitat de Catalunya
- funder_name: Fundaci? Joan Ribas Araquistain

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



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## Fileset

- id: b1254067-9595-481b-8f64-34ae5e29d8d2
  filename: wragg-et-al-2025-dual-action-spectroscopy-exposes-the-bright-and-dark-excitons-of-room-temperature-wse2.pdf
  content_type: application/pdf
  size: 4042239
  md5: cf168d3f1808b77d00c68bb2b7cfb468

## Thumbnail

fileset_id: b1254067-9595-481b-8f64-34ae5e29d8d2
filename: wragg-et-al-2025-dual-action-spectroscopy-exposes-the-bright-and-dark-excitons-of-room-temperature-wse2.pdf