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    The a.c. and d.c. Josephson effects in a Bose–Einstein condensate

    Josephson effects, in which currents 'tunnel' across a thin insulating barrier, were first discovered in a system of two superconductors, the macroscopic wavefunctions of which are weakly coupled via a tunnell...

    S. Levy, E. Lahoud, I. Shomroni, J. Steinhauer in Nature (2007)