# Origin of Subgap States in Normal-Insulator-Superconductor van der Waals Heterostructures

https://mdr.nims.go.jp/datasets/b4ece2d1-41f9-4349-9df0-8151f8eb098d

## Files

- [acs.nanolett.2c02777.pdf](https://mdr.nims.go.jp/filesets/6a519d30-eb8b-4c18-99d3-fe1ed5d6c90e/download) ([Detail](https://mdr.nims.go.jp/filesets/6a519d30-eb8b-4c18-99d3-fe1ed5d6c90e.md))

## Id

b4ece2d1-41f9-4349-9df0-8151f8eb098d

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-14T05:35:49.182899Z

## Updated at

2025-02-14T07:31:09.733564Z

## Published at

2025-02-14T07:31:09.819626Z

## Doi



## First published url

https://doi.org/10.1021/acs.nanolett.2c02777

## Date published

2023-04-12

## Recorded date published

2023-4-12

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Origin of Subgap States in Normal-Insulator-Superconductor van der Waals
    Heterostructures
  title_type: original
  lang: en

## Description

- description: Superconductivity in van der Waals materials, such as NbSe2 and TaS2,
    is fundamentally novel due to the effects of dimensionality, crystal symmetries,
    and strong spin-orbit coupling. In this work we perform tunnel spectroscopy on
    NbSe2 by utilizing MoS2 or hexagonal Boron Nitride (hBN) as a tunnel barrier.
    We observe subgap excitations and probe their origin by studying various heterostructure
    designs. We show that the edge of NbSe2 hosts many defect states, which strongly
    couple to the superconductor and form Andreev bound states. Furthermore, by isolating
    the NbSe2 edge we show that the subgap states are ubiquitous in MoS2 tunnel barriers,
    but absent in hBN tunnel barriers, suggesting defects in MoS2 as their origin.
    Their magnetic nature reveals a singlet or a doublet type ground state and based
    on nearly vanishing g-factors or avoided-crossing of subgap excitations we highlight
    the role of strong spin-orbit coupling.
  description_type: abstract
  lang: und

## Creator

- name: Paritosh Karnatak
  role: author
- name: Zarina Mingazheva
  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: Helmuth Berger
  role: author
- name: László Forró
  role: author
- name: Christian Schönenberger
  role: author

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: Superconductivity
  schema: not_defined
- subject: van der Waals materials
  schema: not_defined
- subject: tunnel spectroscopy
  schema: not_defined

## Rights

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

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## Embargo



## Journal

- title: Nano Letters
  issn: '15306984'
  volume: '23'
  issue: '7'
  start_page: 2454
  end_page: 2459

## Conference



## Related item



## Funding

- funder_name: Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen
    Forschung
- funder_name: Swiss Nanoscience Institute, University of Basel
- identifier: JPMJCR15F3
  funder_name: Core Research for Evolutional Science and Technology
- identifier: 19H05790
  funder_name: Japan Society for the Promotion of Science
- identifier: 20H00354
  funder_name: Japan Society for the Promotion of Science
- identifier: '787414'
  funder_name: H2020 European Research Council

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## Fileset

- id: 6a519d30-eb8b-4c18-99d3-fe1ed5d6c90e
  filename: acs.nanolett.2c02777.pdf
  content_type: application/pdf
  size: 5422681
  md5: ddb356e5e2e8e7f6bc763b6a780f7f7a

## Thumbnail

fileset_id: 6a519d30-eb8b-4c18-99d3-fe1ed5d6c90e
filename: acs.nanolett.2c02777.pdf