We have calculated the frequency-dependent gap function for a superconductor in the strong-coupling limit {λ}{}1, where {λ} 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, {λ}{}1, where structure occurs on an energy scale determined by the boson frequency.
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Marsiglio et al. (1991) studied this question.