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Correlation information in strongly correlated electron systems can beobtained using an extended Drude model. An interesting method related to theextended Drude model analysis of superconducting optical data was proposedrecently, and it has attracted attention from researchers. This method aims toextract the optical self-energy of quasiparticles (or residual unpairedelectrons) from measured optical data in the superconducting state. However,this residual optical self-energy is a partial optical self-energy. Theinterpretation and significance of this partial optical self-energy is unclear.We investigate this method using a reverse process with simple electron-bosonspectral density functions. With our obtained results, we conclude that theresidual (or partial) optical self-energy is difficult to interpret because itcontains unphysical features, in particular, a negative optical effective mass.The present study clarifies the extended Drude analysis method forsuperconducting optical data.

Extended Drude model analysis of superconducting optical spectra of correlated electron systems