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説明:

Magic-angle twisted bilayer graphene (MATBG) combines in one single material different phases like insulating, metallic and superconducting. These phases and their in-situ tunability make MATBG an important platform for the fabrication of superconducting devices. We realize a split gate-defined geometry which enables us to tune the width of a superconducting channel formed in MATBG. We observe a smooth transition from superconductivity to highly resistive transport by progressively reducing the channel width using the split gates or by reducing the density in the channel. Using the gate-defined constriction, we control the flow of the supercurrent, either guiding it through the constriction or throughout the whole device or even blocking its passage completely. This serves as a foundation for developing quantum constriction devices like superconducting quan- tum point contacts, quantum dots, and Cooper-pair boxes in MATBG.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Magic-angle, superconducting devices, split-gate

刊行年月日: 2024-03-06

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Research (ISSN: 26431564) vol. 6 issue. 1 L012051

研究助成金:

• European Research Council 951541
• 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.6.l012051

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更新時刻: 2025-02-23 22:47:15 +0900

MDRでの公開時刻: 2025-02-23 22:47:15 +0900