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説明:

We measured the spectrum of a single-carrier bilayer graphene quantum dot as a function of both parallel and perpendicular magnetic field, using a time-resolved charge detection technique that gives access to individual tunnel events. Thanks to our unprecedented resolution of 4 μeV, we could distinguish all four of the dot’s energy levels, in particular in the range of magnetic field where the first and second excited states cross (B⊥ <∼ 100 mT). We thereby experimentally establish the, hitherto simply extrapolated, single-charge carrier spectrum picture and provide a new upper bound for the inter-valley mixing, equal to our energy resolution.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: bilayer graphene quantum dot
, spin-valley locking
, valley qubit


刊行年月日: 2024-11-09

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 9717

研究助成金:

• Swiss National Science Foundation | National Center of Competence in Research Quantum Science and Technology 51NF40-185902
• MEXT | Japan Society for the Promotion of Science 21H05233 and 23H02052

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-024-54121-4

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更新時刻: 2026-02-16 16:30:18 +0900

MDRでの公開時刻: 2026-02-16 13:57:31 +0900