Evidence for spin-polarized bound states in semiconductor-superconductor-ferromagnetic-insulator islands
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.
- Publication:
-
Physical Review B
- Pub Date:
- January 2022
- DOI:
- 10.1103/PhysRevB.105.L041304
- arXiv:
- arXiv:2104.01463
- Bibcode:
- 2022PhRvB.105d1304V
- Keywords:
-
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Superconductivity
- E-Print:
- Phys. Rev. B 105, L041304 (2022)