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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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: fractional quantum Hall (FQH) states
, bilayer graphene
, hetero-orbital


刊行年月日: 2025-07-22

出版者: American Physical Society (APS)

掲載誌:

• Physical Review X (ISSN: 21603308) vol. 15 issue. 3 031023

研究助成金:

• Basic Energy Sciences DE-SC0005042
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Core Research for Evolutional Science and Technology JPMJCR24A5
• Ministry of Education, Culture, Sports, Science and Technology
• National High Magnetic Field Laboratory
• Mathematical Research Impact Centric Support MTR/2023/000002
• World Premier International Research Center Initiative
• U.S. Department of Energy DE-SC0022947
• National Science Foundation NSF-DMR-1904986
• National Science Foundation NSF-DMR-1644779
• Science and Engineering Research Board
• Department of Science and Technology, Ministry of Science and Technology, India
• Institute of Mathematical Sciences

原稿種別: 出版者版 (Version of record)

MDR DOI:

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

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更新時刻: 2026-03-03 08:30:13 +0900

MDRでの公開時刻: 2026-03-02 17:20:29 +0900