Electronic properties of InAs/Al/EuS hybrid nanowires: Effective Zeeman spin splitting and topological phase diagram

ORAL

Abstract

Motivated by recent experiments on InAs/Al/EuS heterostructures, we theoretically study the electronic properties of semiconductor-superconductor-ferromagnetic insulator hybrid nanowires. Our focus is on the physical mechanisms for inducing the effective Zeeman energy and on whether topological superconductivity can be achieved in these devices. We show that the magnetic proximity effects at the Al/EuS as well as the InAs/EuS interfaces are both essential for inducing a sufficiently large total Zeeman energy. Such a Zeeman energy would also depend on the applied gate voltages, the effect of which is included via an electrostatic potential calculated by the Thomas Fermi-Poisson method. Finally we map out the topological phase diagram of the hybrid system as a function of both the gate voltages and the proximity-induced exchange coupling.

*This work was supported by a subsidy for top consortia for knowledge and innovation (TKl toeslag) by the Dutch ministry of economic affairs, by the Netherlands Or- ganisation for Scientific Research (NWO/OCW) through VIDI grant 680-47-537

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Presenters

  • Chun-Xiao Liu

    • Delft University of Technology

Authors

  • Chun-Xiao Liu

    • Delft University of Technology

  • Yu Liu

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

  • Sergej Schuwalow

    • 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

  • Michael Wimmer

    • Delft University of Technology
    • QuTech and Kavli Institute for Nanoscience, Delft University of Technology