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We report transport measurements of fractional quantum Hall (FQH) states in the N=2 LL in bilayer graphene, a system with spin and valley degrees of freedom in all LLs, and an additional orbital degeneracy in the 8-fold degenerate N=0/N=1 LLs. In contrast with recent observations of particle-hole asymmetry in the N=0/N=1 LLs of bilayer graphene, the FQH states we observe in the N=2 LL are consistent with the composite fermion model: within a LL, they form a complete sequence of particle-hole symmetric states whose relative strength is dependent on their denominators. The FQH states in the N=2 LL display energy gaps of a few Kelvin, comparable to and in some cases larger than those of fractional states in the N=0/N=1 LLs.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Fractional quantum Hall effect, bilayer graphene, electron interactions

刊行年月日: 2016-12-21

出版者: Springer Nature America, Inc

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 7 issue. 1 13908

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/ncomms13908

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更新時刻: 2025-02-27 08:31:18 +0900

MDRでの公開時刻: 2025-02-27 08:31:18 +0900