# Hetero-Orbital Two-Component Fractional Quantum Hall States in Bilayer Graphene

https://mdr.nims.go.jp/datasets/7316d6cb-1ad3-4183-9597-df10162ae841

## Files

- [kfn2-qggs.pdf](https://mdr.nims.go.jp/filesets/6a3902d8-b52d-4f86-850a-914fc756afdc/download) ([Detail](https://mdr.nims.go.jp/filesets/6a3902d8-b52d-4f86-850a-914fc756afdc.md))

## Id

7316d6cb-1ad3-4183-9597-df10162ae841

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2026-02-28T10:26:00.306427Z

## Updated at

2026-03-02T23:30:13.868149Z

## Published at

2026-03-02T08:20:29.416096Z

## Doi



## First published url

https://doi.org/10.1103/kfn2-qggs

## Date published

2025-07-22

## Recorded date published

2025-7

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Hetero-Orbital Two-Component Fractional Quantum Hall States in Bilayer Graphene
  title_type: original
  lang: en

## Description

- description: The nature of the many-body state in a Landau level (LL) is crucially
    dependent on its orbital wave function. For example, in GaAs quantum wells, the
    half-filled n = 0, 1, and 2 LLs exhibit a metallic, a fractional quantum Hall
    (FQH), and a charge density wave state, respectively. Multi-component FQH states
    of electrons with the same orbital wave function but with different spin or valley
    components, where the interaction is SU(2)-isotropic, have also been observed.
    Here we report on the observation and theoretical understanding of a new type
    of “hetero-orbital” two-component FQH states, which occur at the isospin transition
    of the N = 0 and 1 electron LLs in bilayer graphene. Surprisingly, the underlying
    SU(2)-anisotropic interaction also stabilizes two- component FQH states and isospin
    transitions, which however are markedly different from those in homo-orbital systems.
    We observe a strong two-component 2/5 state, the energy gap of which surpasses
    its single-component FQH siblings over a wide range of magnetic field before abruptly
    disappearing at a high field. The anisotropy also leads to a strong asymmetry
    between parallel- vortex and reverse-vortex composite fermion states. Combined
    with detailed theoretical calculations, our work contributes new insights into
    the robustness of multi-component FQH effect.
  description_type: abstract
  lang: und

## Creator

- name: Ke Huang
  role: author
- name: Ajit C. Balram
  role: author
- name: Hailong Fu
  role: author
- name: Chengqi Guo
  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: Jainendra K. Jain
  role: author
- name: Jun Zhu
  role: author

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: 'fractional quantum Hall (FQH) states
    '
  schema: not_defined
- subject: 'bilayer graphene
    '
  schema: not_defined
- subject: 'hetero-orbital
    '
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/
  date_licensed: 2025-07-22

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Physical Review X
  issn: '21603308'
  volume: '15'
  issue: '3'
  article_number: '031023'

## Conference



## Related item



## Funding

- identifier: DE-SC0005042
  funder_name: Basic Energy Sciences
- 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
- funder_name: National High Magnetic Field Laboratory
- identifier: MTR/2023/000002
  funder_name: Mathematical Research Impact Centric Support
- funder_name: World Premier International Research Center Initiative
- identifier: DE-SC0022947
  funder_name: U.S. Department of Energy
- identifier: NSF-DMR-1904986
  funder_name: National Science Foundation
- identifier: NSF-DMR-1644779
  funder_name: National Science Foundation
- funder_name: Science and Engineering Research Board
- funder_name: Department of Science and Technology, Ministry of Science and Technology,
    India
- funder_name: Institute of Mathematical Sciences

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## Fileset

- id: 6a3902d8-b52d-4f86-850a-914fc756afdc
  filename: kfn2-qggs.pdf
  content_type: application/pdf
  size: 1560018
  md5: 3de0b5e8e15ad1ecf61b990a65b0b46a

## Thumbnail

fileset_id: 6a3902d8-b52d-4f86-850a-914fc756afdc
filename: kfn2-qggs.pdf