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We present a detailed experimental study of the effect of Landau level mixing on various FQHs about half filling in a multiband system, namely Bernal stacked trilayer graphene. In pristine TLG, the excitation energy gaps, Landé g-factor, effective mass, and disorder broadening of the odd-denominator FQH states are identical to their hole-conjugate counterpart. This precise PH symmetry stems from the lattice mirror symmetry that precludes Landau-level mixing. Introducing a non-zero displacement field D disrupts this mirror symmetry, facilitating the hybridization between the monolayer-like and bilayer-like Landau levels. This inter-band coupling enhances the Landau level mixing factor η and activates three-body interactions – both of which explicitly break the PHS of FQHs. As a result, various conventional FQHs are completely destabilized, offering a route to explore such mixing effects on FQHs in a controlled way. We establish that the PHS breaking in TLG is of extrinsic origin and is fundamentally distinct from the intrinsic, interaction-driven symmetry breaking observed in the lowest Landau levels of single-layer and bilayer graphene.

権利情報:

• In Copyright
  

  @ American Physical Society

キーワード: Fractional quantum Hall effect (FQHE), Trilayer graphene, Landau level mixing

刊行年月日: 2025-11-12

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Letters (ISSN: 10797114) vol. 135 issue. 20 p. 206501-206501 206501

研究助成金:

• U.S. Army Combat Capabilities Development Command FA5209 22P0166
• Arthritis National Research Foundation
• Department of Science and Technology, Ministry of Science and Technology, India SPR/2023/000185
• Department of Science and Technology, Ministry of Science and Technology, India DST/NM/TUE/QM-10/2019
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Ministry of Education, Culture, Sports, Science and Technology
• World Premier International Research Center Initiative

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1103/frpm-3fs8

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更新時刻: 2026-06-26 16:48:40 +0900

MDRでの公開時刻: 2026-06-26 18:28:48 +0900