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Multi-terminal Josephson junctions as topological matter

Author

Listed:
  • Roman-Pascal Riwar

    (University of Grenoble Alpes, INAC-PHELIQS
    CEA, INAC-PHELIQS)

  • Manuel Houzet

    (University of Grenoble Alpes, INAC-PHELIQS
    CEA, INAC-PHELIQS)

  • Julia S. Meyer

    (University of Grenoble Alpes, INAC-PHELIQS
    CEA, INAC-PHELIQS)

  • Yuli V. Nazarov

    (Kavli Institute of NanoScience, Delft University of Technology)

Abstract

Topological materials and their unusual transport properties are now at the focus of modern experimental and theoretical research. Their topological properties arise from the bandstructure determined by the atomic composition of a material and as such are difficult to tune and naturally restricted to ≤3 dimensions. Here we demonstrate that n-terminal Josephson junctions with conventional superconductors may provide novel realizations of topology in n−1 dimensions, which have similarities, but also marked differences with existing 2D or 3D topological materials. For n≥4, the Andreev subgap spectrum of the junction can accommodate Weyl singularities in the space of the n−1 independent superconducting phases, which play the role of bandstructure quasimomenta. The presence of these Weyl singularities enables topological transitions that are manifested experimentally as changes of the quantized transconductance between two voltage-biased leads, the quantization unit being 4e2/h, where e is the electric charge and h is the Planck constant.

Suggested Citation

  • Roman-Pascal Riwar & Manuel Houzet & Julia S. Meyer & Yuli V. Nazarov, 2016. "Multi-terminal Josephson junctions as topological matter," Nature Communications, Nature, vol. 7(1), pages 1-5, September.
  • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms11167
    DOI: 10.1038/ncomms11167
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    Cited by:

    1. Ko-Fan Huang & Yuval Ronen & Régis Mélin & Denis Feinberg & Kenji Watanabe & Takashi Taniguchi & Philip Kim, 2022. "Evidence for 4e charge of Cooper quartets in a biased multi-terminal graphene-based Josephson junction," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. 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.
    3. Mohit Gupta & Gino V. Graziano & Mihir Pendharkar & Jason T. Dong & Connor P. Dempsey & Chris Palmstrøm & Vlad S. Pribiag, 2023. "Gate-tunable superconducting diode effect in a three-terminal Josephson device," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    4. Gino V. Graziano & Mohit Gupta & Mihir Pendharkar & Jason T. Dong & Connor P. Dempsey & Chris Palmstrøm & Vlad S. Pribiag, 2022. "Selective control of conductance modes in multi-terminal Josephson junctions," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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