# Enhancing Resonant Second-Harmonic Generation in Bilayer WSe<sub>2</sub> by Layer-Dependent Exciton-Polaron Effect

https://mdr.nims.go.jp/datasets/7fbecdd9-a6c5-46a1-9129-d5890a92ffab

## File

- [cha-et-al-2024-enhancing-resonant-second-harmonic-generation-in-bilayer-wse2-by-layer-dependent-exciton-polaron-effect.pdf](https://mdr.nims.go.jp/filesets/c14d812c-1848-499b-ab21-c342b7bb8d97/download) ([Detail](https://mdr.nims.go.jp/filesets/c14d812c-1848-499b-ab21-c342b7bb8d97.md))

## Id

7fbecdd9-a6c5-46a1-9129-d5890a92ffab

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-02-07T10:18:22.527266Z

## Updated at

2026-02-10T03:30:14.327192Z

## Published at

2026-02-10T00:14:31.337703Z

## Doi



## First published url

https://doi.org/10.1021/acs.nanolett.4c04544

## Date published

2024-11-20

## Recorded date published

2024-11-20

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Enhancing Resonant Second-Harmonic Generation in Bilayer WSe<sub>2</sub>
    by Layer-Dependent Exciton-Polaron Effect
  title_type: original
  lang: en

## Description

- description: "Two-dimensional (2D) materials serve as exceptional platforms for\r\ncontrolled
    second-harmonic generation (SHG). Current approaches to SHG control\r\noften depend
    on nonresonant conditions or symmetry breaking via single-gate control.\r\nHere,
    we employ dual-gate bilayer WSe2 to demonstrate an SHG enhancement\r\nconcept
    that leverages strong exciton resonance and a layer-dependent exciton-polaron\r\neffect.
    By selectively localizing injected holes within one layer, we induce exciton-\r\npolaron
    states in the hole-filled layer while maintaining normal exciton states in the\r\ncharge-neutral
    layer. The distinct resonant conditions of these layers effectively break\r\ninterlayer
    inversion symmetry, thereby promoting resonant SHG. This method\r\nachieves a
    remarkable 40-fold enhancement of SHG at minimal electric field, equivalent to
    conditions near the dielectric-breakdown threshold but using only ∼3% of the critical
    breakdown field. Our results highlight SHG sensitivity to carrier density and
    type, offering a new tool for manipulating SHG and probing quantum states in 2D
    excitonic systems."
  description_type: abstract
  lang: und

## Creator

- name: Soonyoung Cha
  role: author
- name: Tianyi Ouyang
  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: Nathaniel M. Gabor
  role: author
- name: Chun Hung Lui
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: 'second-harmonic generation (SHG)
    '
  schema: not_defined
- subject: 'WSe2
    '
  schema: not_defined
- subject: 'exciton-polaron
    '
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/
  date_licensed: 2024-11-20

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Nano Letters
  issn: '15306984'
  volume: '24'
  issue: '46'
  start_page: 14847
  end_page: 14853

## Conference



## Related item



## Funding

- identifier: W911NF2110260
  funder_name: U.S. Department of Defense
- identifier: FA9550-20-1-0097
  funder_name: U.S. Department of Defense
- identifier: 19H05790
  funder_name: Ministry of Education, Culture, Sports, Science and Technology
- identifier: 20H00354
  funder_name: Ministry of Education, Culture, Sports, Science and Technology
- identifier: 21H05233
  funder_name: Ministry of Education, Culture, Sports, Science and Technology
- identifier: 61640-ND6
  funder_name: American Chemical Society
- identifier: '1945660'
  funder_name: National Science Foundation
- identifier: W911NK-24-1-0292
  funder_name: ARO MURI

## 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: c14d812c-1848-499b-ab21-c342b7bb8d97
  filename: cha-et-al-2024-enhancing-resonant-second-harmonic-generation-in-bilayer-wse2-by-layer-dependent-exciton-polaron-effect.pdf
  content_type: application/pdf
  size: 6265446
  md5: c6c0ef34bff9852a2a41463a9ead0705

## Thumbnail

fileset_id: c14d812c-1848-499b-ab21-c342b7bb8d97
filename: cha-et-al-2024-enhancing-resonant-second-harmonic-generation-in-bilayer-wse2-by-layer-dependent-exciton-polaron-effect.pdf