Scanning SQUID Imaging of Epitaxial Semiconductor-Magnetic Insulator Heterostructures

ORAL

Abstract

Semiconductor nanowires with epitaxially grown superconductor are a promising potential host for Majorana bound states. The addition of a magnetic insulator to the system has been shown to induce Zeeman splitting in the nanowire via proximity effect, eliminating the need for an external magnetic field to produce a topologically nontrivial state. We use scanning SQUID microscopy (SSM) to study 2D heterostructures of thin film EuS, a magnetic insulator, on InAs and InSb substrates. Our measurements are a local probe of magnetism as a function of temperature, allowing us to characterize the homogeneity and domain structure of possible proximity-induced magnetism in this magnetic insulator/semiconductor structure. We report the local Curie temperature as a function of the EuS layer thickness and substrate material. These results contribute to a more thorough understanding of the magnetic coupling between EuS and InAs/InSb, which can inform design choices for future devices.

*This work was supported by the Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Contract No. DE-AC02-76SF00515

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Presenters

  • Irene Zhang

    • Stanford Univ

Authors

  • Irene Zhang

    • Stanford Univ

  • Nabhanila Nandi

    • Stanford Univ

  • Yu Liu

    • Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Materials Lab, University of Copenhagen
    • Niels Bohr Institute

  • Peter Krogstrup

    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Materials Lab and Center for Quantum Devices, Niels Bohr Institute,8University of Copenhagen, Kanalvej 7, 2800 Kongens Lyngby, Denmark
    • Niels Bohr Institute, University of Copenhagen
    • Quantum Materials Lab Copenhagen, Microsoft
    • University of Copenhagen
    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen
    • Microsoft Quantum Materials Lab, University of Copenhagen
    • Niels Bohr Institute, Copenhagen
    • Niels Bohr Institute

  • Charles M Marcus

    • Niels Bohr Institute, University of Copenhagen
    • Microsoft Corp
    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
    • Niels Bohr Institute, Microsoft Station Q, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark
    • Center for Quantum Devices and Microsoft Quantum Lab Copenhagen, Niels Bohr Institute, University of Copenhagen

  • Kathryn Ann Moler

    • Stanford Univ
    • Department of Applied Physics and Physics, Stanford University
    • Department of Applied Physics, Stanford University