# Biexciton and Singlet Trion Upconvert Exciton Photoluminescence in a MoSe<sub>2</sub> Monolayer Supported by Acoustic and Optical K-Valley Phonons

https://mdr.nims.go.jp/datasets/ec96dda7-59e0-4857-b013-c42c542d8e82

## File

- [acs.jpclett.3c01982.pdf](https://mdr.nims.go.jp/filesets/6d176f69-e6c0-4238-81d0-18fc02adc01c/download) ([Detail](https://mdr.nims.go.jp/filesets/6d176f69-e6c0-4238-81d0-18fc02adc01c.md))

## Id

ec96dda7-59e0-4857-b013-c42c542d8e82

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-14T02:13:20.397477Z

## Updated at

2025-02-14T07:30:18.436917Z

## Published at

2025-02-14T07:30:18.673769Z

## Doi



## First published url

https://doi.org/10.1021/acs.jpclett.3c01982

## Date published

2023-10-05

## Recorded date published

2023-10-5

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Biexciton and Singlet Trion Upconvert Exciton Photoluminescence in a MoSe<sub>2</sub>
    Monolayer Supported by Acoustic and Optical K-Valley Phonons
  title_type: original
  lang: en

## Description

- description: Transition metal dichalcogenide monolayers represent unique platforms
    for studying both electronic and phononic interactions as well as intra- and intervalley
    exciton com- plexes. Here, we investigate the upconversion of exciton photoluminescence
    in MoSe2 monolayers. Within the nominal transparency window of MoSe2 the exciton
    emission is enhanced for resonantly addressing the spin-singlet negative trion
    and neutral biexci- ton at a few tens of meV below the neutral exciton transition.
    We identify that the A’1 optical phonon at the K valley provides the energy gain
    in the upconversion process at the trion resonance, while ZA(K) phonons with their
    spin- and valley-switching property support the biexciton driven upconversion
    of the exciton emission. Interestingly, the latter is unpolarized due to a superposition
    state formed by the two bright excitons at the K valleys. Our study highlights
    high-order exciton complexes interacting with optical and acoustic K-valley phonons
    and upconverting light into the bright exciton.
  description_type: abstract
  lang: und

## Creator

- name: Joanna Jadczak
  role: author
- name: Joerg Debus
  role: author
- name: Justyna Olejnik
  role: author
- name: Ching-Hwa Ho
  role: author
- 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: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Leszek Bryja
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

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## Keyword

- subject: Van der Waals contacts
  schema: not_defined
- subject: Schottky barrier
  schema: not_defined
- subject: MoS2 transistor
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: The Journal of Physical Chemistry Letters
  issn: '19487185'
  volume: '14'
  issue: '39'
  start_page: 8702
  end_page: 8708

## Conference



## Related item



## Funding

- identifier: TRR 160 B4 249492093
  funder_name: Deutsche Forschungsgemeinschaft
- identifier: '101017733'
  funder_name: European Commission
- identifier: QUANTERAII/1/74/EQUAISE/2022
  funder_name: National Center for Research and Development

## Instrument



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## Fileset

- id: 6d176f69-e6c0-4238-81d0-18fc02adc01c
  filename: acs.jpclett.3c01982.pdf
  content_type: application/pdf
  size: 3292791
  md5: 62ab7c93ab89f06e2c8e4fb2356e3492

## Thumbnail

fileset_id: 6d176f69-e6c0-4238-81d0-18fc02adc01c
filename: acs.jpclett.3c01982.pdf