Oral: Superconducting proximity effect in semiconducting nanowires with ferromagnetic-insulator barriers

We report transport studies of triple-hybrid Josephson junctions based on semiconducting InAs nanowires grown with fully overlapping epitaxial ferromagnetic-insulator EuS and superconductor Al shells. Current transport measurements display a hysteretic superconducting window around the coercive field of the ferromagnet with a sizable supercurrent, accompanied by multiple Andreev reflections. Tunneling spectroscopy reveals a superconducting gap characterized by three coherence peaks. We attribute these findings to exchanged-induced spin splitting combined with spin mixing due to spin-orbit coupling. The realization of proximity-induced superconductivity in a semiconductor through a ferromagnetic insulator opens new avenues for exploring synthetic spin-triplet pairing.