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説明:

Graphene quantum dots are promising candidates for qubits due to weak spin-orbit interaction and minimal hyperfine interactions. The hyperfine interaction, controllable via isotopic purification, could be the key to further improving the coherence. Isotopically enriched graphene has been made by chemical vapor deposition. Here we use isotopically enriched graphite crystals both 12C and 13C grown by high-pressure-high-temperature synthesis to exfoliate graphene layers. We fabricated Hall bar devices and performed quantum transport measurements, revealing mobilities exceeding 10^5cm2/V s and a long mean free path of microns. Shubnikov-de Haas oscillations, quantum Hall effect up to the filling factor of one, and Brown-Zak oscillations due to the alignment of hBN and graphene are observed thanks to the high mobility. These results constitute a material platform for physics and engineering of isotopically-enriched graphene qubits.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Graphene quantum dots, isotopic purification, quantum transport measurements

刊行年月日: 2023-12-07

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Research (ISSN: 26431564) vol. 5 issue. 4 043212

研究助成金:

• H2020 European Research Council 951541
• Horizon 2020 Framework Programme 862660/QUANTUM E LEAPS
• HORIZON EUROPE European Innovation Council 101046231/FantastiCOF
• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 51NF40-185902
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Ministry of Education, Culture, Sports, Science and Technology
• H2020 European Research Council 951541
• Horizon 2020 Framework Programme 862660/QUANTUM E LEAPS
• HORIZON EUROPE European Innovation Council 101046231/FantastiCOF
• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 51NF40-185902
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Ministry of Education, Culture, Sports, Science and Technology

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/physrevresearch.5.043212

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更新時刻: 2025-02-28 12:30:22 +0900

MDRでの公開時刻: 2025-02-28 12:30:22 +0900