# Control of the valley polarization of monolayer WSe<sub>2</sub> by Dexter-like coupling

https://mdr.nims.go.jp/datasets/ffc6c123-22f8-4355-b705-44f52f87e60f

## File

- [Jasiński_2024_2D_Mater._11_025007.pdf](https://mdr.nims.go.jp/filesets/80a57aa7-a9c6-4b88-8ae7-633551c9a93c/download) ([Detail](https://mdr.nims.go.jp/filesets/80a57aa7-a9c6-4b88-8ae7-633551c9a93c.md))

## Id

ffc6c123-22f8-4355-b705-44f52f87e60f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-25T00:55:47.150427Z

## Updated at

2025-02-25T23:30:22.606953Z

## Published at

2025-02-25T23:30:22.701544Z

## Doi



## First published url

https://doi.org/10.1088/2053-1583/ad1ae8

## Date published

2024-04-01

## Recorded date published

2024-4-1

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Control of the valley polarization of monolayer WSe<sub>2</sub> by Dexter-like
    coupling
  title_type: original
  lang: en

## Description

- description: Intervalley scattering mechanisms govern the dynamics of excitonic
    complexes in transition metal dichalcogenide monolayers. Here, we investigate
    the excitation energy dependence of the valley polarization of excitons in a WSe2
    monolayer. We observe that the valley polarization drastically decreases when
    the excitation is resonant with the B1s resonance. This behaviour can be explained
    by a Dexter-like coupling in the momentum space between exciton states residing
    in opposite valleys but with the same spin configuration. This induces a net transfer
    of the exciton population from the optically driven valley towards the opposite,
    undriven valley. We observe the long-term fingerprints of this population transfer,
    as a vanishing valley polarization for the neutral exciton, and a negative valley
    polarization for biexcitonic complexes, in qualitative agreement with theoretical
    predictions based on a fully microscopic many-particle approach. This, together
    with a decrease of the PL energy when the excitation is resonant with the B1s
    state, points to the prominent role of the Dexter-like coupling in the exciton
    dynamics of atomically thin semiconductors.
  description_type: abstract
  lang: und

## Creator

- name: Jakub Jasiński
  role: author
- name: Joshua J P Thompson
  role: author
- name: Swaroop Palai
  role: author
- name: Maciej Śmiertka
  role: author
- name: Mateusz Dyksik
  role: author
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Michał Baranowski
  role: author
- name: Duncan K Maude
  role: author
- name: Alessandro Surrente
  role: author
- name: Ermin Malic
  role: author
- name: Paulina Płochocka
  role: author

## Contact agent



## Publisher

organization: IOP Publishing

## Managing organization



## Keyword

- subject: Intervalley scattering
  schema: not_defined
- subject: excitonic complexes
  schema: not_defined
- subject: WSe2
  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: '11'
  issue: '2'
  article_number: '025007'

## Conference



## Related item



## Funding

- identifier: 2020/38/E/ST3/00194
  funder_name: Narodowe Centrum Nauki
- identifier: 19H05790
  funder_name: Japan Society for the Promotion of Science
- identifier: Programme des Investissement d’Avenir
  funder_name: Agence Nationale de la Recherche
- identifier: CRC 1083
  funder_name: Deutsche Forschungsgemeinschaft

## 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: 80a57aa7-a9c6-4b88-8ae7-633551c9a93c
  filename: Jasiński_2024_2D_Mater._11_025007.pdf
  content_type: application/pdf
  size: 1327127
  md5: 2d291a769f68a084c2327f9241e8d576

## Thumbnail

fileset_id: 80a57aa7-a9c6-4b88-8ae7-633551c9a93c
filename: Jasiński_2024_2D_Mater._11_025007.pdf