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.
|Journal||Physical Review B|
|Number of pages||5|
|Publication status||Published - 31 Jan 2022|
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