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Ballistic superconductivity and tunable π–junctions in InSb quantum wells

Author

Listed:
  • Chung Ting Ke

    (Delft University of Technology)

  • Christian M. Moehle

    (Delft University of Technology)

  • Folkert K. Vries

    (Delft University of Technology)

  • Candice Thomas

    (Purdue University
    Purdue University)

  • Sara Metti

    (Purdue University
    Purdue University)

  • Charles R. Guinn

    (Purdue University)

  • Ray Kallaher

    (Purdue University
    Purdue University)

  • Mario Lodari

    (Delft University of Technology)

  • Giordano Scappucci

    (Delft University of Technology)

  • Tiantian Wang

    (Purdue University
    Purdue University)

  • Rosa E. Diaz

    (Purdue University)

  • Geoffrey C. Gardner

    (Purdue University
    Purdue University)

  • Michael J. Manfra

    (Purdue University
    Purdue University
    Purdue University
    Purdue University)

  • Srijit Goswami

    (Delft University of Technology)

Abstract

Planar Josephson junctions (JJs) made in semiconductor quantum wells with large spin-orbit coupling are capable of hosting topological superconductivity. Indium antimonide (InSb) two-dimensional electron gases (2DEGs) are particularly suited for this due to their large Landé g-factor and high carrier mobility, however superconducting hybrids in these 2DEGs remain unexplored. Here we create JJs in high quality InSb 2DEGs and provide evidence of ballistic superconductivity over micron-scale lengths. A Zeeman field produces distinct revivals of the supercurrent in the junction, associated with a 0−π transition. We show that these transitions can be controlled by device design, and tuned in-situ using gates. A comparison between experiments and the theory of ballistic π-Josephson junctions gives excellent quantitative agreement. Our results therefore establish InSb quantum wells as a promising new material platform to study the interplay between superconductivity, spin-orbit interaction and magnetism.

Suggested Citation

  • Chung Ting Ke & Christian M. Moehle & Folkert K. Vries & Candice Thomas & Sara Metti & Charles R. Guinn & Ray Kallaher & Mario Lodari & Giordano Scappucci & Tiantian Wang & Rosa E. Diaz & Geoffrey C. , 2019. "Ballistic superconductivity and tunable π–junctions in InSb quantum wells," Nature Communications, Nature, vol. 10(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-11742-4
    DOI: 10.1038/s41467-019-11742-4
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