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Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions

Author

Listed:
  • Sadashige Matsuo

    (Center for Emergent Matter Science, RIKEN)

  • Takaya Imoto

    (Center for Emergent Matter Science, RIKEN
    Tokyo University of Science)

  • Tomohiro Yokoyama

    (Osaka University)

  • Yosuke Sato

    (Center for Emergent Matter Science, RIKEN)

  • Tyler Lindemann

    (Purdue University
    Purdue University)

  • Sergei Gronin

    (Purdue University)

  • Geoffrey C. Gardner

    (Purdue University)

  • Sho Nakosai

    (Nagoya University)

  • Yukio Tanaka

    (Nagoya University)

  • Michael J. Manfra

    (Purdue University
    Purdue University
    Purdue University
    Purdue University)

  • Seigo Tarucha

    (Center for Emergent Matter Science, RIKEN
    RIKEN Center for Quantum Computing, RIKEN)

Abstract

The Josephson junction (JJ) is an essential element of superconducting (SC) devices for both fundamental and applied physics. The short-range coherent coupling of two adjacent JJs forms Andreev molecule states (AMSs), which provide a new ingredient to engineer exotic SC phenomena such as topological SC states and Andreev qubits. Here we provide tunneling spectroscopy measurements on a device consisting of two electrically controllable planar JJs sharing a single SC electrode. We discover that Andreev spectra in the coupled JJ are highly modulated from those in the single JJs and possess phase-dependent AMS features reproduced in our numerical calculation. Notably, the SC gap closing due to the AMS formation is experimentally observed. Our results help in understanding SC transport derived from the AMS and promoting the use of AMS physics to engineer topological SC states and quantum information devices.

Suggested Citation

  • Sadashige Matsuo & Takaya Imoto & Tomohiro Yokoyama & Yosuke Sato & Tyler Lindemann & Sergei Gronin & Geoffrey C. Gardner & Sho Nakosai & Yukio Tanaka & Michael J. Manfra & Seigo Tarucha, 2023. "Phase-dependent Andreev molecules and superconducting gap closing in coherently-coupled Josephson junctions," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-44111-3
    DOI: 10.1038/s41467-023-44111-3
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    References listed on IDEAS

    as
    1. Marco Coraiola & Daniel Z. Haxell & Deividas Sabonis & Hannes Weisbrich & Aleksandr E. Svetogorov & Manuel Hinderling & Sofieke C. Kate & Erik Cheah & Filip Krizek & Rüdiger Schott & Werner Wegscheide, 2023. "Phase-engineering the Andreev band structure of a three-terminal Josephson junction," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Antonio Fornieri & Alexander M. Whiticar & F. Setiawan & Elías Portolés & Asbjørn C. C. Drachmann & Anna Keselman & Sergei Gronin & Candice Thomas & Tian Wang & Ray Kallaher & Geoffrey C. Gardner & Er, 2019. "Evidence of topological superconductivity in planar Josephson junctions," Nature, Nature, vol. 569(7754), pages 89-92, May.
    3. Zhaoen Su & Alexandre B. Tacla & Moïra Hocevar & Diana Car & Sébastien R. Plissard & Erik P. A. M. Bakkers & Andrew J. Daley & David Pekker & Sergey M. Frolov, 2017. "Andreev molecules in semiconductor nanowire double quantum dots," Nature Communications, Nature, vol. 8(1), pages 1-6, December.
    4. R. S. Deacon & A. Oiwa & J. Sailer & S. Baba & Y. Kanai & K. Shibata & K. Hirakawa & S. Tarucha, 2015. "Cooper pair splitting in parallel quantum dot Josephson junctions," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    5. R. S. Deacon & A. Oiwa & J. Sailer & S. Baba & Y. Kanai & K. Shibata & K. Hirakawa & S. Tarucha, 2015. "Erratum: Cooper pair splitting in parallel quantum dot Josephson junctions," Nature Communications, Nature, vol. 6(1), pages 1-1, December.
    6. Hechen Ren & Falko Pientka & Sean Hart & Andrew T. Pierce & Michael Kosowsky & Lukas Lunczer & Raimund Schlereth & Benedikt Scharf & Ewelina M. Hankiewicz & Laurens W. Molenkamp & Bertrand I. Halperin, 2019. "Topological superconductivity in a phase-controlled Josephson junction," Nature, Nature, vol. 569(7754), pages 93-98, May.
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