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Voltage-tunable spin supercurrent nonreciprocity reaching 100% efficiency

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arxiv 2410.07337 v2 pith:7SYFBGHA submitted 2024-10-09 cond-mat.supr-con

Chi Sun , Johanne Bratland Tjernshaugen , Jacob Linder This is my paper · ORCID
classification cond-mat.supr-con
keywords nonreciprocalspinsupercurrenttransportbeendirectionefficiencypossible
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The superconducting version of a diode effect has been the subject of extensive research in the past few years. So far, the focus has almost exclusively been on charge transport, but a natural question is whether it is possible to obtain nonreciprocal spin transport without dissipation. Here, we demonstrate that it is possible to generate electrically tunable nonreciprocal spin transport carried by a supercurrent using superconductor/ferromagnet multilayers. The nonreciprocal spin supercurrent reaches an ideal efficiency of 100%, meaning that the spin-polarization of the critical current is finite in one flow direction whereas it vanishes in the other direction. We explain the underlying physics generating this phenomenon. This result provides a way to integrate nonreciprocal supercurrents with spin-polarization, offering new functionality in quantum technologies based on Josephson junctions.

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  1. Josephson transistor and robust supercurrent enhancement with spin-split superconductors

    cond-mat.supr-con 2024-11 conditional novelty 6.0 of 10

    Spin-splitting fields can more than double the Josephson critical current in long superconductor-normal-superconductor junctions and lower the voltage needed for π-transitions.

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