# Long-lived valley states in bilayer graphene quantum dots

https://mdr.nims.go.jp/datasets/290ec883-02b8-41a2-aa33-cc3e19b3e648

## File

- [s41567-023-02334-7.pdf](https://mdr.nims.go.jp/filesets/26668a22-bf42-42f3-bca2-9789e6aa08d7/download) ([Detail](https://mdr.nims.go.jp/filesets/26668a22-bf42-42f3-bca2-9789e6aa08d7.md))

## Id

290ec883-02b8-41a2-aa33-cc3e19b3e648

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-18T05:59:35.896855Z

## Updated at

2025-02-23T13:48:19.979035Z

## Published at

2025-02-23T13:48:20.045960Z

## Doi



## First published url

https://doi.org/10.1038/s41567-023-02334-7

## Date published

2024-01-17

## Recorded date published

2024-3

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Long-lived valley states in bilayer graphene quantum dots
  title_type: original
  lang: en

## Description

- description: We report the first measurement of the characteristic relaxation times
    of spin and valley states, obtained in a high-quality Bilayer graphene (BLG) device
    containing gate-defined double quantum dots. We show that valley states can be
    distinguished with a fidelity of well above 99 % and report remarkably long singlet–triplet
    intervalley relaxation times, exceeding 500ms at B = 250mT, more than one order
    of magnitude longer than the relaxation times we measure for spin states. Our
    approach to isolating valley states paves the way to measuring coherent valley-qubit
    oscillations and, in combination with the recently demonstrated electrical tunability
    of the valley g-factor, could provide a practical platform for the electrical
    control of long-lived valley qubits in BLG.
  description_type: abstract
  lang: und

## Creator

- name: Rebekka Garreis
  role: author
- name: Chuyao Tong
  role: author
- name: Jocelyn Terle
  role: author
- name: Max Josef Ruckriegel
  role: author
- name: Jonas Daniel Gerber
  role: author
- name: Lisa Maria Gächter
  role: author
- name: Kenji Watanabe
  role: author
  orcid: https://orcid.org/0000-0003-3701-8119
  organization: National Institute for Materials Science
- name: Takashi Taniguchi
  role: author
  orcid: https://orcid.org/0000-0002-1467-3105
  organization: National Institute for Materials Science
- name: Thomas Ihn
  role: author
- name: Klaus Ensslin
  role: author
- name: Wei Wister Huang
  role: author

## Contact agent



## Publisher

organization: Springer Science and Business Media LLC

## Managing organization



## Keyword

- subject: Bilayer graphene
  schema: not_defined
- subject: valley qubits
  schema: not_defined
- subject: relaxation time
  schema: not_defined

## Rights

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

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Nature Physics
  issn: '17452481'
  volume: '20'
  issue: '3'
  start_page: 428
  end_page: 434

## Conference



## Related item



## Funding



## 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: 26668a22-bf42-42f3-bca2-9789e6aa08d7
  filename: s41567-023-02334-7.pdf
  content_type: application/pdf
  size: 2491023
  md5: de3a5572512ece71a800a5e82af76315

## Thumbnail

fileset_id: 26668a22-bf42-42f3-bca2-9789e6aa08d7
filename: s41567-023-02334-7.pdf