# Electromechanical Response of Saddle Points in Twisted hBN Moiré Superlattices

https://mdr.nims.go.jp/datasets/1de76584-8d39-44f6-a860-7fef9dff3aad

## File

- [chiodini-et-al-2025-electromechanical-response-of-saddle-points-in-twisted-hbn-moiré-superlattices.pdf](https://mdr.nims.go.jp/filesets/c8c8d219-703a-4eb3-9839-b425ee609f73/download) ([Detail](https://mdr.nims.go.jp/filesets/c8c8d219-703a-4eb3-9839-b425ee609f73.md))

## Id

1de76584-8d39-44f6-a860-7fef9dff3aad

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-02-15T02:24:45.423577Z

## Updated at

2026-02-17T03:30:06.585912Z

## Published at

2026-02-17T00:10:58.571971Z

## Doi



## First published url

https://doi.org/10.1021/acsnano.4c12315

## Date published

2025-05-06

## Recorded date published

2025-5-6

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Electromechanical Response of Saddle Points in Twisted hBN Moiré Superlattices
  title_type: original
  lang: en

## Description

- description: In twisted layered materials (t-LMs), an inter-layer rotation can break
    inversion symmetry and create an interfacial array of staggered out-of-plane polarization
    due to AB/BA stacking registries. This symmetry breaking can also trigger the
    formation of edge in-plane polarizations localized along the perimeter of AB/BA
    regions (i.e., saddle point domains). However, a comprehensive experimental investigation
    of these features is still lacking. Here, we use piezo force microscopy to probe
    the electromechanical behavior of twisted hexagonal boron nitride (t-hBN). For
    parallel stacking alignment of t-hBN, we reveal very narrow (width ~ 10 nm) saddle
    point in-plane polarizations, which we also measure in the anti-parallel configuration.
    These localized polarizations can still be found on a multiply stacked t-hBN structure,
    determining the formation of a double moiré. Our findings imply that polarizations
    in t-hBN do not only point in the out-of-plane direction but also show an in-plane
    component, giving rise to a much more complex 3D polarization field.
  description_type: abstract
  lang: und

## Creator

- name: Stefano Chiodini
  role: author
- name: Giacomo Venturi
  role: author
- name: James Kerfoot
  role: author
- name: Jincan Zhang
  role: author
- name: Evgeny M. Alexeev
  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: Andrea C. Ferrari
  role: author
- name: Antonio Ambrosio
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: 'twisted hBN
    '
  schema: not_defined
- subject: moiré superlattices
  schema: not_defined
- subject: 'piezo force microscopy
    '
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2025-04-23

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: ACS Nano
  issn: '19360851'
  volume: '19'
  issue: '17'
  start_page: 16297
  end_page: 16306

## Conference



## Related item



## Funding

- identifier: EP/K01711X/1
  funder_name: Engineering and Physical Sciences Research Council
- identifier: EP/K017144/1
  funder_name: Engineering and Physical Sciences Research Council
- identifier: EP/L016087/1
  funder_name: Engineering and Physical Sciences Research Council
- identifier: EP/N010345/1
  funder_name: Engineering and Physical Sciences Research Council
- identifier: EP/V000055/1
  funder_name: Engineering and Physical Sciences Research Council
- identifier: EP/X015742/1
  funder_name: Engineering and Physical Sciences Research Council
- identifier: '817794'
  funder_name: European Research Council
- identifier: 2019-3923
  funder_name: Fondazione Cariplo
- funder_name: Graphene Flagship

## 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: c8c8d219-703a-4eb3-9839-b425ee609f73
  filename: chiodini-et-al-2025-electromechanical-response-of-saddle-points-in-twisted-hbn-moiré-superlattices.pdf
  content_type: application/pdf
  size: 2854494
  md5: 82fd6ed2d9a717f8731536a87ef361b6

## Thumbnail

fileset_id: c8c8d219-703a-4eb3-9839-b425ee609f73
filename: chiodini-et-al-2025-electromechanical-response-of-saddle-points-in-twisted-hbn-moiré-superlattices.pdf