# Ultrafast dynamics of bright and dark excitons in monolayer WSe<sub>2</sub> and heterobilayer WSe<sub>2</sub>/MoS<sub>2</sub>

https://mdr.nims.go.jp/datasets/3e68b94d-70ea-491a-a3fe-26ecd4af6548

## File

- [Bange_2023_2D_Mater._10_035039.pdf](https://mdr.nims.go.jp/filesets/43bf8a60-b21a-4a02-bdf7-0e979ba2ad2c/download) ([Detail](https://mdr.nims.go.jp/filesets/43bf8a60-b21a-4a02-bdf7-0e979ba2ad2c.md))

## Id

3e68b94d-70ea-491a-a3fe-26ecd4af6548

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-25T00:29:20.601555Z

## Updated at

2025-02-25T07:30:36.932301Z

## Published at

2025-02-25T07:30:37.093487Z

## Doi



## First published url

https://doi.org/10.1088/2053-1583/ace067

## Date published

2023-07-01

## Recorded date published

2023-7-1

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Ultrafast dynamics of bright and dark excitons in monolayer WSe<sub>2</sub>
    and heterobilayer WSe<sub>2</sub>/MoS<sub>2</sub>
  title_type: original
  lang: en

## Description

- description: 'The energy landscape of optical excitations in mono- and few-layer
    transition metal dichalcogenides (TMDs) is dominated by optically bright and dark
    excitons. These excitons can be fully localized within a single TMD layer, or
    the electron- and the hole-component of the exciton can be charge-separated over
    multiple TMD layers. Such intra- or interlayer excitons have been characterized
    in detail using all-optical spectroscopies, and, more recently, photoemission
    spectroscopy. In addition, there are so-called hybrid excitons whose electron-
    and/or hole-component are delocalized over two or more TMD layers; so far, a detailed
    characterization of the energy landscape and dynamics of optically dark hybrid
    excitons is missing. In this work, using femtosecond momentum microscopy, we quantitatively
    compare the formation dynamics of momentum-forbidden intralayer excitons in monolayer
    WSe2 with the formation dynamics of momentum-forbidden hybrid excitons in heterobilayer
    WSe2/MoS2, and draw three key conclusions: First, we find that the energy of hybrid
    excitons is reduced when compared to excitons with pure intralayer character.
    Second, in direct comparison with microscopic modelling, we show that the momentum-forbidden
    intralayer and hybrid excitons are formed via exciton-phonon scattering from optically
    excited bright excitons. And third, we show that the efficiency for phonon absorption
    and emission processes in the mono- and the heterobilayer is strongly dependent
    on the energy alignment of the dark intralayer and hybrid excitons with respect
    to the optically excited bright exciton.'
  description_type: abstract
  lang: und

## Creator

- name: Jan Philipp Bange
  role: author
- name: Paul Werner
  role: author
- name: David Schmitt
  role: author
- name: Wiebke Bennecke
  role: author
- name: Giuseppe Meneghini
  role: author
- name: AbdulAziz AlMutairi
  role: author
- name: Marco Merboldt
  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: Sabine Steil
  role: author
- name: Daniel Steil
  role: author
- name: R Thomas Weitz
  role: author
- name: Stephan Hofmann
  role: author
- name: G S Matthijs Jansen
  role: author
- name: Samuel Brem
  role: author
- name: Ermin Malic
  role: author
- name: Marcel Reutzel
  role: author
- name: Stefan Mathias
  role: author

## Contact agent



## Publisher

organization: IOP Publishing

## Managing organization



## Keyword

- subject: Optical excitations
  schema: not_defined
- subject: hybrid excitons
  schema: not_defined
- subject: charge-transfer processes
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: 2D Materials
  issn: '20531583'
  volume: '10'
  issue: '3'
  article_number: '035039'

## Conference



## Related item



## Funding

- funder_name: saudi arabian ministry for higher education
- identifier: '881603'
  funder_name: Graphene Flagship
- identifier: 217133147/SFB 1073
  funder_name: Deutsche Forschungsgemeinschaft
- identifier: 20H00354
  funder_name: Japan Society for the Promotion of Science
- identifier: MEXT
  funder_name: World Premier International Research Center
- identifier: EP/T001038/1
  funder_name: Engineering and Physical Sciences Research Council

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Process for specimen treatment



## Computational method



## Energy level/transition state



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## Fileset

- id: 43bf8a60-b21a-4a02-bdf7-0e979ba2ad2c
  filename: Bange_2023_2D_Mater._10_035039.pdf
  content_type: application/pdf
  size: 1311536
  md5: be352928325c56386f7bd7a9020f40d6

## Thumbnail

fileset_id: 43bf8a60-b21a-4a02-bdf7-0e979ba2ad2c
filename: Bange_2023_2D_Mater._10_035039.pdf