Stationary Josephson effect in a short multiterminal junction

Abstract

We study the dc Josephson effect and the density of states in a multiterminal structure of cross-type geometry that consists of four superconducting electrodes connected by one-dimensional normal or ferromagnetic wires. We find that the Josephson current IJz has a sinusoidal dependence on the phase difference ϕz between the superconductors in the horizontal wire with a critical current Ic that can be varied by changing the phase difference ϕy between the superconductors in the vertical wire. The period of the function IJz(ϕz) depends on the ratio of the interface resistances RSn,z/RSn,y being equal to 2π if this ratio is small and equal to 4π in the opposite limit. We also calculate the amplitudes of both the singlet and the odd-frequency triplet components in the system under consideration. The triplet component amplitude may be significantly larger than the amplitude of the singlet component.

Source-reported materials — not catalogue approval

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