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

ORAL

Abstract

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.

*Research at NBI is supported by the Danish National Research Foundation, European Innovation Council (Grant Agreement No. 101115548), and a research grant (Projects No. 43951 and No. 53097) from VILLUM FONDEN.

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Presenters

  • Junting Zhao

    • Niels Bohr Institute, University of Copenhagen

Authors

  • Junting Zhao

    • Niels Bohr Institute, University of Copenhagen

  • David Razmadze

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark

  • Yu Liu

    • Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark

  • Peter Krogstrup

    • Niels Bohr Institute, University of Copenhagen

  • Andrei Mazanik

    • Centro de Física de Materiales Centro Mixto CSIC-UPV/EHU,\\E-20018 Donostia–San Sebastián, Spain

  • Sebastian Bergeret

    • Centro de Física de Materiales Centro Mixto CSIC-UPV/EHU,\\E-20018 Donostia–San Sebastián, Spain

  • Saulius Vaitiekenas

    • University of Copenhagen