# Dielectric catastrophe at the Wigner-Mott transition in a moiré superlattice

https://mdr.nims.go.jp/datasets/fb05d0fd-f225-4fac-a936-6b6b204582e5

## File

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## Id

fb05d0fd-f225-4fac-a936-6b6b204582e5

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-26T08:36:57.315356Z

## Updated at

2025-02-27T07:31:00.853676Z

## Published at

2025-02-27T07:31:00.917791Z

## Doi



## First published url

https://doi.org/10.1038/s41467-022-32037-1

## Date published

2022-07-25

## Recorded date published



## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Dielectric catastrophe at the Wigner-Mott transition in a moiré superlattice
  title_type: original
  lang: en

## Description

- description: The metal-insulator transition (MIT) driven by electronic correlations
    is a fundamental and challenging problem in condensed-matter physics. Particularly,
    whether such a transition can be continuous remains open. The emergence of semiconducting
    moiré materials with continuously tunable bandwidth provides an ideal platform
    to study interaction-driven MITs. Although a bandwidth-tuned MIT at fixed full
    electron filling of the moiré superlattice has been reported recently, that at
    fractional filling, which involves translational symmetry breaking of the underlying
    superlattice, remains elusive. Here, we demonstrate bandwidth-tuned MITs in a
    MoSe2/WS2 moiré superlattice at both integer and fractional fillings using the
    exciton sensing technique. The bandwidth is controlled by an out-of-plane electric
    field. The dielectric response is probed optically with the 2s exciton in a remote
    WSe2 sensor layer. The exciton spectral weight is negligible for the metallic
    state, consistent with a large negative dielectric constant. It continuously vanishes
    when the transition is approached from the insulating side, corresponding to a
    diverging dielectric constant or a ‘dielectric catastrophe’. Our results support
    continuous interaction-driven MITs in a two-dimensional triangular lattice and
    stimulate future explorations of exotic quantum phases, such as quantum spin liquids,
    in their vicinities.
  description_type: abstract
  lang: und

## Creator

- name: Yanhao Tang
  role: author
- name: Jie Gu
  role: author
- name: Song Liu
  role: author
- 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: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: James C. Hone
  role: author
- name: Kin Fai Mak
  role: author
- name: Jie Shan
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Wigner-Mott transition
  schema: not_defined
- subject: MoSe2/WS2
  schema: not_defined
- subject: dielectric catastrophe
  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: '13'
  issue: '1'
  article_number: '4271'

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## Specimen



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## Fileset

- id: 3d8d574f-0a13-494a-81c4-4e9b4119e7b3
  filename: s41467-022-32037-1.pdf
  content_type: application/pdf
  size: 1749215
  md5: 3ba431165d4ac1b70a9df39eb41770a0

## Thumbnail

fileset_id: 3d8d574f-0a13-494a-81c4-4e9b4119e7b3
filename: s41467-022-32037-1.pdf