# Harmonic to anharmonic tuning of moiré potential leading to unconventional Stark effect and giant dipolar repulsion in WS2/WSe2 heterobilayer

https://mdr.nims.go.jp/datasets/677fea34-d832-4548-bb20-ac200690166a

## File

- [s41467-023-40329-3.pdf](https://mdr.nims.go.jp/filesets/3d11172e-3e47-41c2-ba03-6a24db8a9610/download) ([Detail](https://mdr.nims.go.jp/filesets/3d11172e-3e47-41c2-ba03-6a24db8a9610.md))

## Id

677fea34-d832-4548-bb20-ac200690166a

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-10T00:08:32.569570Z

## Updated at

2025-02-11T03:30:44.310803Z

## Published at

2025-02-11T03:30:44.410351Z

## Doi



## First published url

https://doi.org/10.1038/s41467-023-40329-3

## Date published

2023-08-04

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Harmonic to anharmonic tuning of moiré potential leading to unconventional
    Stark effect and giant dipolar repulsion in WS2/WSe2 heterobilayer
  title_type: original
  lang: en

## Description

- description: Excitonic states trapped in harmonic moir ́e wells in twisted heterobilayers
    is an excellent platform to study many-body interaction. However, the moir ́e
    exciton potential is primarily governed by the rigid twist angle, and its dynamic
    tuning thus remains a challenge - a knob which would be highly desirable for both
    scientific exploration and device applications. Using moir ́e trapped excitonic
    emission as a probe, here we demonstrate dynamic tuning of moir ́e potential in
    a WS2/WSe2 heterobilayer through two anharmonic perturbations, induced by gate
    voltage and optical power. First, we show that, dictated by the Poisson equation,
    a gate voltage can result in a local in-plane perturbing field with odd parity
    around the high-symmetry points. This allows us to simultaneously observe the
    first (linear) and second (parabolic) order Stark shift for the ground state and
    first excited state, respectively, of the moir ́e trapped exciton - an effect
    exactly opposite to conventional quantum-confined Stark shift. Depending on the
    degree of confinement, the moir ́e trapped excitons exhibit up to twenty-fold
    gate-tunability in the lifetime (100 ns to 5 ns). The second anharmonic tuning
    is demonstrated through exciton localization dependent dipolar repulsion, leading
    to an optical power-induced blueshift as high as ∼1 meV/μW, which is about 5 times
    higher than previous reports.
  description_type: abstract
  lang: und

## Creator

- name: Suman Chatterjee
  role: author
- name: Medha Dandu
  role: author
- name: Pushkar Dasika
  role: author
- name: Rabindra Biswas
  role: author
- name: Sarthak Das
  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: Varun Raghunathan
  role: author
- name: Kausik Majumdar
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Excitonic states
  schema: not_defined
- subject: moiré potential
  schema: not_defined
- subject: gate voltage
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Nature Communications
  issn: '20411723'
  volume: '14'
  issue: '1'
  article_number: '4679'

## Conference



## Related item



## Funding

- funder_name: DST | Science and Engineering Research Board
- funder_name: Indian Space Research Organisation
- funder_name: Ministry of Electronics and Information technology

## Instrument



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## Measurement method



## Specimen



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## Fileset

- id: 3d11172e-3e47-41c2-ba03-6a24db8a9610
  filename: s41467-023-40329-3.pdf
  content_type: application/pdf
  size: 3127924
  md5: 9b1dee0d6ee140a265cedc3eaa3f356c

## Thumbnail

fileset_id: 3d11172e-3e47-41c2-ba03-6a24db8a9610
filename: s41467-023-40329-3.pdf