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

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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.

Original languageEnglish
Article numberL041304
JournalPhysical Review B
Issue number4
Number of pages5
Publication statusPublished - 31 Jan 2022

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© 2022 American Physical Society.


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