# Dark-state impact on the exciton recombination of WS2 monolayers as revealed by multi-timescale pump-probe spectroscopy

https://mdr.nims.go.jp/datasets/48350a77-db86-4095-961a-4ca206242985

## File

- [PhysRevB.102.195407.pdf](https://mdr.nims.go.jp/filesets/95af821b-e4dd-45b9-861e-d2d81d2636d3/download) ([Detail](https://mdr.nims.go.jp/filesets/95af821b-e4dd-45b9-861e-d2d81d2636d3.md))

## Id

48350a77-db86-4095-961a-4ca206242985

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-27T06:14:26.574814Z

## Updated at

2025-02-27T23:31:31.636237Z

## Published at

2025-02-27T23:31:31.710838Z

## Doi



## First published url

https://doi.org/10.1103/physrevb.102.195407

## Date published

2020-11-05

## Recorded date published

2020-11

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Dark-state impact on the exciton recombination of WS2 monolayers as revealed
    by multi-timescale pump-probe spectroscopy
  title_type: original
  lang: en

## Description

- description: The luminescence yield of transition metal dichalcogenide monolayers
    frequently suffers from the formation of long-lived dark states, which include
    excitons with intervalley charge carriers, spin-forbidden transitions, and a large
    center-of-mass momentum located outside the light cone of dispersion relations.
    Efficient relaxation from bright exciton states to dark states suppresses the
    quantum yield of photon emission. In addition, the radiative recombination of
    excitons is heavily influenced by Auger-type exciton-exciton scattering, which
    yields another nonradiative relaxation channel at room temperature. Here, we show
    that Auger-type scattering is promoted not only between (bright) excitons but
    also between excitons and long-lived dark states. We studied the luminescence
    dynamics of monolayer WS2 capped with hexagonal BN over broad time ranges of picoseconds
    to milliseconds using carefully designed pump-and-probe techniques. We observed
    that luminescence quenching associated with Auger-type scattering occurs on 1-100
    μs time scales, which thus correspond to the lifetimes of the relevant dark states.
    The broad distribution of the measured lifetimes implies the impact of various
    types of long-lived states on the exciton annihilation process.
  description_type: abstract
  lang: und

## Creator

- name: Takashi Kuroda
  role: author
  orcid: https://orcid.org/0000-0001-6445-7673
- name: Yusuke Hoshi
  role: author
- name: Satoru Masubuchi
  role: author
- name: Mitsuhiro Okada
  role: author
- name: Ryo Kitaura
  role: author
  orcid: https://orcid.org/0000-0001-8108-109X
  organization: National Institute for Materials Science
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
- name: Tomoki Machida
  role: author

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: Luminescence yield
  schema: not_defined
- subject: dark states
  schema: not_defined
- subject: Auger-type scattering
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Physical Review B
  issn: 1550235X
  volume: '102'
  issue: '19'
  article_number: '195407'

## Conference



## Related item



## Funding

- identifier: JPMJCR15F3
  funder_name: Japan Science and Technology Agency
- identifier: JPMJCR16F3
  funder_name: Japan Science and Technology Agency
- identifier: JP19H01820
  funder_name: Japan Society for the Promotion of Science
- identifier: JP20H00127
  funder_name: Japan Society for the Promotion of Science
- identifier: JP20H00354
  funder_name: Japan Society for the Promotion of Science
- identifier: JP20H05664
  funder_name: Japan Society for the Promotion of Science

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## Fileset

- id: 95af821b-e4dd-45b9-861e-d2d81d2636d3
  filename: PhysRevB.102.195407.pdf
  content_type: application/pdf
  size: 739380
  md5: '045472938a06a5e8fc136deb703f9673'

## Thumbnail

fileset_id: 95af821b-e4dd-45b9-861e-d2d81d2636d3
filename: PhysRevB.102.195407.pdf