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arXiv · 2104.01463

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

S. Vaitiekėnas·R. Seoane Souto·Y. Liu·P. Krogstrup·K. Flensberg·M. Leijnse·C. M. Marcus
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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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S. Vaitiekėnas, R. Seoane Souto, Y. Liu, P. Krogstrup, K. Flensberg, M. Leijnse, C. M. Marcus. 2021-04-03. Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic insulator islands. https://doi.org/10.1103/physrevb.105.l041304

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