Phonon linewidths with two screened electron-phonon couplings are not
overscreened
Phonon linewidths with two screened electron-phonon couplings are not
overscreened
In this paper we conclusively demonstrate that Density Functional Perturbation Theory calculations of phonon linewidths are not affected by overscreening issues. Additionally, we present an exact formula designed to incorporate nonadiabatic and correlation effects while ensuring the positivity of the linewidths. Finally, we extend the treatment to nonequilibrium scenarios and …