# Imaging the effect of high photoexcited densities on valley polarization and coherence in MoS2 monolayers

https://mdr.nims.go.jp/datasets/b7b1f9ba-f85d-4e23-931c-a8335e1c9fca

## File

- [s41699-022-00303-x.pdf](https://mdr.nims.go.jp/filesets/7c9d8204-987f-4c1c-81d2-d72675950894/download) ([Detail](https://mdr.nims.go.jp/filesets/7c9d8204-987f-4c1c-81d2-d72675950894.md))

## Id

b7b1f9ba-f85d-4e23-931c-a8335e1c9fca

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-27T05:04:30.444239Z

## Updated at

2025-02-27T23:31:04.626874Z

## Published at

2025-02-27T23:31:04.715029Z

## Doi



## First published url

https://doi.org/10.1038/s41699-022-00303-x

## Date published

2022-04-11

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Imaging the effect of high photoexcited densities on valley polarization
    and coherence in MoS2 monolayers
  title_type: original
  lang: en

## Description

- description: 'We have investigated the steady-sate valley polarization and valley
    coherence of encapsulated MoS2 monolayers as a function of the temperature and
    the power density of a continuous wave laser excitation. Both valley polarization
    and coherence exhibit a non-monotonic dependence on sample temperature, attaining
    a local maximum at T ≈ 40 K. This has been recently attributed to a motional narrowing
    effect: an enhancement of the valley relaxation time occurs when the scattering
    rate increases. At a fixed temperature of T = 6 K, a two-fold increase of the
    steady-state valley polarization is achieved by increasing the laser excitation
    power, which we attribute to a local heating induced by the energy relaxation
    of photoexcited excitons outside the light cone. In contrast, in the same power
    range only a moderate enhancement of valley coherence is observed. Further increasing
    the excitation power leads to a small reduction of valley polarization and a dramatic
    loss of valley coherence. Supported by spatial imaging of the excitonic luminescence
    and polarization, we attribute this behaviour to the detrimental role of exciton-exciton
    interactions on both the valley lifetime and the pure dephasing rate.'
  description_type: abstract
  lang: und

## Creator

- name: F. Cadiz
  role: author
- name: S. Gerl
  role: author
- name: T. Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: K. Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Valley polarization
  schema: not_defined
- subject: MoS2 monolayer
  schema: not_defined
- subject: exciton-exciton interactions
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: npj 2D Materials and Applications
  issn: '23977132'
  volume: '6'
  issue: '1'
  article_number: '27'

## Conference



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## 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



## Software



## Custom property



## Fileset

- id: 7c9d8204-987f-4c1c-81d2-d72675950894
  filename: s41699-022-00303-x.pdf
  content_type: application/pdf
  size: 1371759
  md5: ebfc1fda6903c576f64dfde09bd96bf2

## Thumbnail

fileset_id: 7c9d8204-987f-4c1c-81d2-d72675950894
filename: s41699-022-00303-x.pdf