# Phonon-limited valley lifetimes in single-particle bilayer graphene quantum dots

https://mdr.nims.go.jp/datasets/e731027d-0b9c-4e70-9343-24a5c1510244

## File

- [dkgn-pfjb.pdf](https://mdr.nims.go.jp/filesets/e40ea92b-e378-40b2-9155-7169f593adf2/download) ([Detail](https://mdr.nims.go.jp/filesets/e40ea92b-e378-40b2-9155-7169f593adf2.md))

## Id

e731027d-0b9c-4e70-9343-24a5c1510244

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-05-04T07:18:49.665295Z

## Updated at

2026-05-11T04:42:33.036392Z

## Published at

2026-05-11T07:25:08.721159Z

## Doi



## First published url

https://doi.org/10.1103/dkgn-pfjb

## Date published

2025-07-10

## Recorded date published

2025-7

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Phonon-limited valley lifetimes in single-particle bilayer graphene quantum
    dots
  title_type: original
  lang: en

## Description

- description: The valley degree of freedom in honeycomb crystals such as 2D semiconductors,
    graphene and bilayer graphene (BLG) is a promising carrier of quantum information
    alongside spin and charge. This is all the more true since gate- controlled single-particle
    quantum dots (QDs) have been demonstrated in bilayer graphene, paving the way
    for the realisation of spin and valley qubits. Although long spin relaxation times
    have recently been reported in BLG QDs, nothing is known about single-particle
    valley lifetimes. Here we report single-particle valley relaxation times (T1 times)
    exceeding several microseconds in electrostatically defined BLG QDs. The observed
    dependence of T1 on the perpendicular magnetic field can be understood qualitatively
    and quantitatively by a model in which T1 is limited by electron-phonon coupling.
    We identify coupling to acoustic phonons via the bond length change and via the
    deformation potential as the limiting mechanisms.
  description_type: abstract
  lang: und

## Creator

- name: L. Banszerus
  role: author
- name: K. Hecker
  role: author
- name: L. Wang
  role: author
- name: S. Möller
  role: author
- name: K. Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
- name: T. Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
- name: G. Burkard
  role: author
- name: C. Volk
  role: author
- name: C. Stampfer
  role: author

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: 'bilayer graphene quantum dots
    '
  schema: not_defined
- subject: valley lifetime
  schema: not_defined
- subject: electron-phonon coupling
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2025-07-10

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Physical Review B
  issn: 1550235X
  volume: '112'
  issue: '3'
  start_page: 35409
  end_page: 35409
  article_number: '035409'

## Conference



## Related item



## Funding

- identifier: STA 1146/11-1
  funder_name: Deutsche Forschungsgemeinschaft
- identifier: '425217212'
  funder_name: Deutsche Forschungsgemeinschaft
- identifier: '425217212'
  funder_name: Deutsche Forschungsgemeinschaft
- identifier: 21H05233
  funder_name: Japan Society for the Promotion of Science
- identifier: 23H02052
  funder_name: Japan Society for the Promotion of Science
- identifier: JPMJCR24A5
  funder_name: Core Research for Evolutional Science and Technology
- funder_name: Ministry of Education, Culture, Sports, Science and Technology
- identifier: '820254'
  funder_name: European Research Council
- identifier: EXC 2004/1-390534769
  funder_name: Deutsche Forschungsgemeinschaft

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



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## Process for specimen treatment



## Computational method



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## Fileset

- id: e40ea92b-e378-40b2-9155-7169f593adf2
  filename: dkgn-pfjb.pdf
  content_type: application/pdf
  size: 979965
  md5: 36c2822f19791b03c1bccb12ad36cb7a

## Thumbnail

fileset_id: e40ea92b-e378-40b2-9155-7169f593adf2
filename: dkgn-pfjb.pdf