APS Logo

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.

–

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