Abstract
A general formula for Josephson current in a wide class of hybrid junctions between different internal structures is derived on the basis of the Andreev picture. The formula extends existing formulae and also enables us to analyze novel B -phase/A-phase/B -phase (BAB) junctions in superfluid He systems, which are accessible to experiments. It is predicted that BAB junctions will exhibit two types of current-phase relations associated with different internal symmetries. A “pseudo-magnetic interface effect” inherent in the system is also revealed.
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