Supercurrent in Graphene-Based Josephson Junctions

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  • Yamamoto Michihisa
    東京大学大学院工学系　研究科・理化学研究所　創発物性科学研究センター
  • V. Borzenets Ivan
    東京大学大学院工学系研究科
  • Tarucha Seigo
    東京大学大学院工学系　研究科・理化学研究所　創発物性科学研究センター

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Other Title
  • グラフェンのジョセフソン接合における超伝導流
  • グラフェン ノ ジョセフソン セツゴウ ニ オケル チョウデンドウリュウ

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Abstract

<p>Graphene-based Josephson junction is electrically tunable and can achieve a clean ballistic regime, where the mean free path of the graphene weak link exceeds the junction length. Systematic analysis of the critical current reveals theoretically expected critical current scaling in both diffusive and ballistic regimes. In the long diffusive regime, the critical current scales with the Thouless energy. In the ballistic regime, it scales with the superconductor gap when the junction length is smaller than the coherence length (short junction regime), otherwise it scales with the energy proportional to the inverse junction length (long junction regime). We also show that we can spatially split two electrons of a Cooper pair in graphene-superconductor junctions. In particular, supercurrent can flow through a quantum Hall state, where a Cooper pair splits into opposite edge channels through the electron-hole hybrid modes formed in the superconductor-quantum Hall interfaces.</p>

Journal

  • Butsuri

    Butsuri 72 (11), 774-782, 2017-11-05

    The Physical Society of Japan

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