# Motion of Two-Dimensional Excitons in Momentum Space Leads to Pseudospin Distribution Narrowing on the Bloch Sphere

https://mdr.nims.go.jp/datasets/c2e67806-ecc0-41a6-8602-59d8c97d51e7

## File

- [2024A00528G_Manuscript.pdf](https://mdr.nims.go.jp/filesets/9f47cff4-e18b-450c-9fa6-3954a8ffe7fe/download) ([Detail](https://mdr.nims.go.jp/filesets/9f47cff4-e18b-450c-9fa6-3954a8ffe7fe.md))
- [2024A00528G_Supporting_Information.pdf](https://mdr.nims.go.jp/filesets/84451973-b203-4bfd-b039-4c562d22dafe/download) ([Detail](https://mdr.nims.go.jp/filesets/84451973-b203-4bfd-b039-4c562d22dafe.md))
- [2024A00528G_Supplementary_videos.zip](https://mdr.nims.go.jp/filesets/b0da5e05-de87-485a-8634-37ec912c9096/download) ([Detail](https://mdr.nims.go.jp/filesets/b0da5e05-de87-485a-8634-37ec912c9096.md))

## Id

c2e67806-ecc0-41a6-8602-59d8c97d51e7

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-07-28T02:00:14.959138Z

## Updated at

2025-07-29T03:30:27.767433Z

## Published at

2025-07-29T03:21:26.441262Z

## Doi



## First published url

https://doi.org/10.1021/acs.nanolett.3c04808

## Date published

2024-05-08

## Recorded date published

2024-5-8

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Motion of Two-Dimensional Excitons in Momentum Space Leads to Pseudospin
    Distribution Narrowing on the Bloch Sphere
  title_type: original
  lang: en

## Description

- description: 'Motional narrowing implies narrowing induced by motion, for example,
    in nuclear resonance, the thermally induced random motion of the nuclei in an
    inhomogeneous environment leads to counter-intuitive narrowing of the resonance
    line. Similarly, the excitons in monolayer semiconductors experience magnetic
    inhomogeneity: the electron-hole spinexchange interaction manifests as an in-plane
    pseudo-magnetic field with a periodically varying orientation inside the exciton
    band. The excitons undergo random momentum scattering and pseudospin precession
    repeatedly in this inhomogeneous magnetic environment – typically resulting in
    fast exciton depolarization. On the contrary, we show that such magnetic inhomogeneity
    averages out at high scattering rate due to motional narrowing. Physically, a
    faster exciton scattering leads to a narrower pseudospin distribution on the Bloch
    sphere, implying a nontrivial improvement in exciton polarization. The in-plane
    nature of the pseudomagnetic field enforces a contrasting scattering dependence
    between the circularly and linearly polarized excitons – providing a spectroscopic
    way to gauge the sample quality.'
  description_type: abstract
  lang: en

## Creator

- name: Garima Gupta
  role: author
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
- name: Kausik Majumdar
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: 2D materials
  schema: not_defined
- subject: Exciton Pseudospin
  schema: not_defined
- subject: Valley Decoherence
  schema: not_defined
- subject: Motional Narrowing
  schema: not_defined
- subject: Polarization Contrast
  schema: not_defined
- subject: MoS2
  schema: not_defined

## Rights

- description: This document is the Accepted Manuscript version of a Published Work
    that appeared in final form in Nano Letters, copyright © 2024 American Chemical
    Society after peer review and technical editing by the publisher. To access the
    final edited and published work see https://doi.org/10.1021/acs.nanolett.3c04808.
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-04-26
end_date: 2025-04-26

## Journal

- title: Nano Letters
  issn: '15306984'
  volume: '24'
  issue: '18'
  start_page: 5413
  end_page: 5419

## Conference



## Related item



## Funding

- funder_name: Indian Space Research Organisation
- funder_name: Ministry of Education, Culture, Sports, Science and Technology
- funder_name: Science and Engineering Research Board
- identifier: 21H05233
  funder_name: Japan Society for the Promotion of Science
- identifier: 23H02052
  funder_name: Japan Society for the Promotion of Science
- funder_name: Karnataka Innovation and Technology Society

## 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: 9f47cff4-e18b-450c-9fa6-3954a8ffe7fe
  filename: 2024A00528G_Manuscript.pdf
  content_type: application/pdf
  size: 1027582
  md5: 02ca2369a04f6af1032142952b72513a
- id: 84451973-b203-4bfd-b039-4c562d22dafe
  filename: 2024A00528G_Supporting_Information.pdf
  content_type: application/pdf
  size: 635491
  md5: 1fdb9172e99ba7718cf3f44f4ac99820
- id: b0da5e05-de87-485a-8634-37ec912c9096
  filename: 2024A00528G_Supplementary_videos.zip
  content_type: application/zip
  size: 25529403
  md5: 216161fcf3cc6981de714069d9dba22f

## Thumbnail

fileset_id: 9f47cff4-e18b-450c-9fa6-3954a8ffe7fe
filename: 2024A00528G_Manuscript.pdf