Abstract
Static and dynamic local-field effects as well as scattering effects beyond the Born approximation are taken into account in the calculation of self-energies, consistently with sum rules and boundary conditions; nearly exact solutions to Dyson equations for the Green's functions in electron liquids are thereby obtained. A relaxation-time argument is given which leads to a nonequilibrium Green's function for an interpretation of the band structures measured in photoemission experiments. Calculations including the core-electron effects excellently account for the experimental data on bandwidths and mean free paths.
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