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  • Letter

Evidence for spin-polarized bound states in semiconductor–superconductor–ferromagnetic-insulator islands

S. Vaitiekėnas1, R. Seoane Souto1,2, Y. Liu1, P. Krogstrup1, K. Flensberg1, M. Leijnse1,2, and C. M. Marcus1

  • 1Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
  • 2Division of Solid State Physics and NanoLund, Lund University, 22100 Lund, Sweden

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Phys. Rev. B 105, L041304 – Published 31 January, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.L041304

Abstract

We report Coulomb blockade transport studies of semiconducting InAs nanowires grown with epitaxial superconducting Al and ferromagnetic insulator EuS on overlapping facets. Comparing experiment to a theoretical model, we associate cotunneling features in even-odd bias spectra with spin-polarized Andreev levels. Results are consistent with zero-field spin splitting exceeding the induced superconducting gap. Energies of subgap states are tunable on either side of zero via electrostatic gates.

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Phys. Rev. B 105, L041304– Published 31 January, 2022
  • Received 5 April 2021
  • Revised 26 December 2021
  • Accepted 10 January 2022
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