Experimental demonstration of a tunable, field-free Josephson diode in sputter-deposited NbN/GdN/NbN mesa junctions showing up to 40% efficiency at zero field and operation to 4.2 K.
I ≤ 0: ϕs, β → −ϕs, β, ϕ p, α → −ϕp, α (S36) We now plot the variation of critical current Ic vs the external field He for various cases
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Field-free Josephson diode with controllable efficiency using magnetic tunnel barrier
Experimental demonstration of a tunable, field-free Josephson diode in sputter-deposited NbN/GdN/NbN mesa junctions showing up to 40% efficiency at zero field and operation to 4.2 K.