# Interactions and ultrafast dynamics of exciton complexes in a monolayer semiconductor with electron gas

https://mdr.nims.go.jp/datasets/762ed750-f522-4547-ae90-0dd3ab333405

## File

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## Id

762ed750-f522-4547-ae90-0dd3ab333405

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-14T06:42:50.014733Z

## Updated at

2025-02-15T03:30:26.689705Z

## Published at

2025-02-15T03:30:26.875585Z

## Doi



## First published url

https://doi.org/10.1515/nanoph-2023-0913

## Date published

2024-02-21

## Recorded date published

2024-2-21

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Interactions and ultrafast dynamics of exciton complexes in a monolayer semiconductor
    with electron gas
  title_type: original
  lang: en

## Description

- description: We present femtosecond pump-probe measurements of neutral and charged
    exciton optical response in monolayer MoSe2 to resonant photoexcitation of a given
    exciton state in the presence of 2D electron gas. We show that creation of charged
    exciton (X−) population in a given K,K’ valley requires the capture of available
    free carriers in the opposite valley and reduces the interaction of neutral X
    with the Fermi sea. We also observe spectral broadening of X transition line with
    the increasing X− population caused by efficient scattering and excitation induced
    dephasing. From the valley-resolved analysis of the observed effects we are able
    to extract the spin-valley relaxation times of free carriers as a function of
    carrier density. Moreover, we analyze the oscillator strength and energy shift
    of X in the Fermi sea regime under resonant excitation. From this we can observe
    the process of X decay by radiative recombination paired with trion formation
    effect. We demonstrate an increase of neutral exciton relaxation rate with the
    introduction of Fermi sea of electrons. We ascribe the observed effect to the
    increased efficiency of trion formation channel, as well as the radiative decay
    caused by the screening of disorder by the free carriers.
  description_type: abstract
  lang: und

## Creator

- name: Aleksander Rodek
  role: author
- name: Kacper Oreszczuk
  role: author
- name: Tomasz Kazimierczuk
  role: author
- name: James Howarth
  role: author
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
- name: Marek Potemski
  role: author
- name: Piotr Kossacki
  role: author

## Contact agent



## Publisher

organization: Walter de Gruyter GmbH

## Managing organization



## Keyword

- subject: Pump-probe measurements
  schema: not_defined
- subject: exciton optical response
  schema: not_defined
- subject: MoSe2
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Nanophotonics
  issn: '21928614'
  volume: '13'
  issue: '4'
  start_page: 487
  end_page: 497

## Conference



## Related item



## Funding

- identifier: Graphene Flagship
  funder_name: European Union
- identifier: IRA-MAB/2018/9 Grant
  funder_name: Fundacja na rzecz Nauki Polskiej
- identifier: SG 0P Program of the EU
  funder_name: Fundacja na rzecz Nauki Polskiej
- identifier: 2020/39/B/ST3/03251
  funder_name: Narodowe Centrum Nauki
- identifier: 2021/41/N/ST3/04240
  funder_name: Narodowe Centrum Nauki

## Instrument



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## Measurement method



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## Fileset

- id: 2fa89b55-7712-435f-b1f6-a4b00091bec4
  filename: 10.1515_nanoph-2023-0913.pdf
  content_type: application/pdf
  size: 2848252
  md5: 858a060b114659d5173ffd490ed4dcf2

## Thumbnail

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filename: 10.1515_nanoph-2023-0913.pdf