학술논문
Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic insulator islands
Document Type
Working Paper
Author
Source
Phys. Rev. B 105, L041304 (2022)
Subject
Language
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.