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We have calculated the frequency-dependent gap function for a superconductor in the strong-coupling limit 1, where is the electron-boson mass-renormalization parameter. We find a multipeaked function which leads to a spectral function with quasiparticle-like resonances on an energy scale determined by the gap. This is in contrast to the moderate-coupling regime, 1, where structure occurs on an energy scale determined by the boson frequency.
Marsiglio et al. (Fri,) studied this question.
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