Phonon spectral function of the Holstein polaron

@article{Loos2006PhononSF,
  title={Phonon spectral function of the Holstein polaron},
  author={Jan Loos and Martin Hohenadler and A. Alvermann and Holger Fehske},
  journal={Journal of Physics: Condensed Matter},
  year={2006},
  volume={18},
  pages={7299-7312}
}
The phonon spectral function of the one-dimensional Holstein model is obtained within weak-coupling and strong-coupling approximations based on analytical self-energy calculations. The characteristic excitations found in the limit of small charge-carrier density are related to the known (electronic) spectral properties of Holstein polarons such as the polaron band dispersion. Particular emphasis is laid on the different physics occurring in the adiabatic and anti-adiabatic regimes, respectively… 

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