Even without electron-electron interactions, electron-phonon and electron-impurity scattering produce non-Lorentzian spectra and non-Fermi-like momentum distributions, which the authors call trivial non-Fermi liquids.
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Coupled electron-impurity and electron-phonon systems as trivial non-Fermi liquids
Even without electron-electron interactions, electron-phonon and electron-impurity scattering produce non-Lorentzian spectra and non-Fermi-like momentum distributions, which the authors call trivial non-Fermi liquids.