In bilayer superconductors, the lower Josephson plasmon is a c-axis-polarized, counterflowing current mode whose spectral weight vanishes at zero out-of-plane momentum, which is why it appears as a ghost.
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Ghost Josephson plasmon in bilayer superconductors
In bilayer superconductors, the lower Josephson plasmon is a c-axis-polarized, counterflowing current mode whose spectral weight vanishes at zero out-of-plane momentum, which is why it appears as a ghost.