Induced superconductivity in InSb 2DEGs

ORAL

Abstract

Superconductor-semiconductor hybrid systems are promising candidates to create Majorana zero modes (MZMs). Using a semiconductor two-dimensional electron gas (2DEG) could allow one to create complex networks required for Majorana qubit schemes. In this regard, InSb 2DEGs stand out due to their large g-factor, strong spin-orbit coupling, and low disorder. We integrate such high-quality 2DEGs with NbTiN to create Josephson junctions (JJs), thus providing the first demonstration of induced superconductivity in InSb 2DEGs. Remarkably, the supercurrent persists over several microns and shows distinct signatures of ballistic transport. Applying an in-plane magnetic field produces a revival of the supercurrent due to a Zeeman induced 0-π transition, where the transition field scales linearly with the junction length. Moreover, we show that this transition can be tuned in-situ using gate voltages, which allows us to map out the free energy landscape of the JJ as a function of density and magnetic field. Our experiments are consistent with the expected behavior of 0-π transitions in ballistic JJs and are an important step toward creating robust MZMs in 2DEG-based π-junctions.

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Presenters

  • Chung-Ting Ke

    • Department of Physics, Duke University
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands

Authors

  • Chung-Ting Ke

    • Department of Physics, Duke University
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands

  • Christian M. Möhle

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands

  • Folkert De Vries

    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands

  • Candice Thomas

    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University

  • Sara Metti

    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA

  • Charles R Guinn

    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA

  • Ray Kallaher

    • Microsoft
    • Microsoft Quantum at Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA
    • Birck Nanotechnology Center, Purdue University
    • Microsoft Quantum at Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA

  • Geoffrey C. Gardner

    • Microsoft
    • Microsoft Quantum at Station Q Purdue, Purdue University
    • Microsoft Quantum at Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA
    • Microsoft Station Q Purdue
    • Birck Nanotechnology Center, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Microsoft Quantum at Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Purdue University, Station Q Purdue

  • Michael Manfra

    • Purdue University
    • Microsoft
    • Department of Physics and Astronomy and Station Q Purdue, Purdue University
    • Department of Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907 USA
    • Microsoft Station Q Purdue
    • Physics and Astronomy, Purdue University
    • Department of Physics and Astronomy, School of Materials Engineering and School of Electrical and Computer Engineering, Purdue University
    • Station Q Purdue and Department of Physics and Astronomy, Purdue University
    • Dept. of Physics, Purdue University
    • Department of Physics and Astronomy and Station Q Purdue, Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
    • Dept. of Physics and Astronomy, Purdue
    • Purdue University, Station Q Purdue
    • Department of Physics and Astronomy, Station Q Purdue, and Birck Nanotechnology Center, Purdue University

  • Srijit Goswami

    • QuTech and Kavli Institute of NanoScience, Delft University of Technology, 2600 GA, Delft, The Netherlands
    • QuTech, Delft University of Technology
    • QuTech and Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands