In the crystal, infinitesimal translational symmetry breaking makes the phonon, In ferromagnet, time-reversal symmetry breaking makes magnon. I know that in superconductor there is a spontaneous symmetry breaking of U(1). In the consequence, which kind of quasi-particle is in superconductor? At first, I thought it is Bogoliubov quasi-particles, but it has mass. What's this?
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