Download file (4.36MB)
Download as zip (4.01MB)

コレクション

引用

説明:

Fractional quantum Hall (FQH) states are exotic quantum many-body phases whose elementary charged excitations are neither bosons nor fermions but anyons, obeying fractional braiding statistics. While most FQH states are believed to have Abelian anyons, the Moore-Read type states with even denominators, appearing at half filling of a Landau level (LL), are predicted to possess non-Abelian excitations with appealing potentials in topological quantum computation. These states, however, depend sensitively on the orbital contents of the single-particle LL wavefunctions and the mixing between different LLs. Although they have been observed in a few materials, their non-Abelian statistics still awaits experimental confirmation. Here we show magnetotransport measurements on Bernal-stacked trilayer graphene (TLG), whose unique multiband structure facilitates the interlaced LL mixing, which can be controlled by external magnetic and displacement fields. We observe a series of robust FQH states including even-denominator ones at filling factors ν = −9/2, −3/2, 3/2 and 9/2. In addition, we are able to finetune the LL mixing and crossings to drive quantum phase transitions of these half-filling states and their neighboring odd-denominator ones, exhibiting a related emerging and waning behavior. Our results establish TLG as a controllable system for tuning LL orbital contents and their mixing strengths, and a fresh platform to seek for non-Abelian quasi-particles.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Fractional quantum Hall, non-Abelian excitations, Bernal-stacked trilayer graphene

刊行年月日: 2024-07-24

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 6236

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/s41467-024-50589-2

関連資料:

その他の識別子:

連絡先:

更新時刻: 2025-02-06 12:31:03 +0900

MDRでの公開時刻: 2025-02-06 12:31:03 +0900