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説明:

We demonstrate that the mode number of Andreev bound states in bilayer graphene Josephson junctions can be modulated by controlling the superconducting coherence length in situ. By exploiting the quadratic band dispersion of bilayer graphene, we control the Fermi velocity and thus the coherence length via the application of electrostatic gating. Tunneling spectroscopy of the Andreev bound states reveals a crossover from short to long Josephson junction regimes as we approach the charge neutral point of the bilayer graphene. Furthermore, analysis of different mode numbers of the Andreev energy spectrum allows us to estimate the phase-dependent Josephson current quantitatively. Our work provides a new way for studying multi-mode Andreev levels by tuning the Fermi velocity.

権利情報:

• In Copyright
  © 2024 American Physical Society

キーワード: Andreev bound states, Bilayer graphene, Josephson junction

刊行年月日: 2024-05-30

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Letters (ISSN: 10797114) vol. 132 issue. 22 p. 226301-226301 226301

研究助成金:

• National Research Foundation of Korea 2021R1A6A1A10042944
• National Research Foundation of Korea 2022M3H4A1A04074153
• National Research Foundation of Korea RS-2023-00207732
• National Research Foundation of Korea RS-2023-00208291
• National Research Foundation of Korea 2023M3K5A1094810
• National Research Foundation of Korea 2023M3K5A1094813
• Ministry of Science and ICT, South Korea IITP-2022-RS-2022-00164799
• Air Force Office of Scientific Research FA2386-22-1-4061
• Institute of Basic Science IBS-R014-D1
• Samsung Science and Technology Foundation SSTF-BA2101-06
• Samsung Science and Technology Foundation SSTF-BA2002-05
• Samsung IO201207-07801-01
• Japan Society for the Promotion of Science 21H05233
• Japan Society for the Promotion of Science 23H02052
• Ministry of Education, Culture, Sports, Science and Technology
• Basic Science Research Institute Fund 2021R1A6A1A10042944
• World Premier International Research Center Initiative

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1103/physrevlett.132.226301

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更新時刻: 2025-08-28 08:30:38 +0900

MDRでの公開時刻: 2025-08-28 08:18:03 +0900