# Single- and narrow-line photoluminescence in a boron nitride-supported MoSe<math>  <msub><mrow></mrow> <mn>2</mn> </msub></math>/graphene heterostructure

https://mdr.nims.go.jp/datasets/d452816a-2a90-4fdf-ade6-73fc9d192d02

## Files

- [CRPHYS_2021__22_S4_77_0.pdf](https://mdr.nims.go.jp/filesets/368bc4fa-6ed4-49a7-b4d4-c923ae8a3314/download) ([Detail](https://mdr.nims.go.jp/filesets/368bc4fa-6ed4-49a7-b4d4-c923ae8a3314.md))

## Id

d452816a-2a90-4fdf-ade6-73fc9d192d02

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-25T05:42:00.638012Z

## Updated at

2025-02-26T03:30:36.780130Z

## Published at

2025-02-26T03:30:36.921261Z

## Doi



## First published url

https://doi.org/10.5802/crphys.58

## Date published

2022-03-08

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Single- and narrow-line photoluminescence in a boron nitride-supported MoSe<mml:math
    xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow /> <mml:mn>2</mml:mn>
    </mml:msub></mml:math>/graphene heterostructure
  title_type: original
  lang: en

## Description

- description: Using of Raman scattering and photoluminescence spectroscopies at variable
    temperature, we report a comprehensive characterization of a MoSe2 monolayer deposited
    onto hBN and capped by mono- and bilayer graphene. Along with the atomically flat
    hBN susbstrate, a single graphene epilayer is sufficient to passivate the MoSe2
    layer and provides a homogenous environment without the need for an extra hBN
    capping layer. As a result, we do not observe photo-induced doping in our heterostructure
    and the MoSe2 photoluminescence linewidth gets as low as 1.8 meV, hence approaching
    the homo- geneous limit. The semi-metallic graphene layer neutralizes the 2D semiconductor
    and enables picosec- ond non-radiative energy transfer that quenches radiative
    recombination from long-lived states. As a result, emission from the neutral band
    edge exciton largely dominates the photoluminescence spectrum of the MoSe2/graphene
    heterostructure. Since this exciton has a picosecond radiative lifetime at low
    temperature, comparable with the energy transfer time, its emission is only quenched
    by a factor of 3 ± 1 and 4.5 ± 1 in the presence of mono- and bilayer graphene
    at liquid helium temperature. Finally, we exploit the valley- contrasting properties
    of monolayer TMDs and show that our simple van der Waals assembly provides a single-line
    2D chiral emitter with degrees of valley polarization and coherence up to 22 ±
    3 and 42 ± 3 at low temperature under excitation 60 meV above the bright exciton
    line.
  description_type: abstract
  lang: und

## Creator

- name: Luis Enrique Parra López
  role: author
- name: Loïc Moczko
  role: author
- name: Joanna Wolff
  role: author
- name: Aditya Singh
  role: author
- name: Etienne Lorchat
  role: author
- name: Michelangelo Romeo
  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: Stéphane Berciaud
  role: author

## Contact agent



## Publisher

organization: Cellule MathDoc/Centre Mersenne

## Managing organization



## Keyword

- subject: Van der Waals heterostructures
  schema: not_defined
- subject: molybdenum diselenide
  schema: not_defined
- subject: graphene
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Comptes Rendus. Physique
  issn: '18781535'
  volume: '22'
  issue: S4
  start_page: 77
  end_page: 88

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## Measurement method



## Specimen



## Chemical composition



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## Fileset

- id: 368bc4fa-6ed4-49a7-b4d4-c923ae8a3314
  filename: CRPHYS_2021__22_S4_77_0.pdf
  content_type: application/pdf
  size: 1089323
  md5: f4a80aaa9071e3bdd7980aa079ec8fa2

## Thumbnail

fileset_id: 368bc4fa-6ed4-49a7-b4d4-c923ae8a3314
filename: CRPHYS_2021__22_S4_77_0.pdf