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Autori: Adrian Stan, Nils Erik Dahlen and Robert van Leeuwen
Editorial: Journal of Chemical Physics, 130, p.224101, 2009.
We have developed a time propagation scheme for the Kadanoff-Baym equations for general inhomogeneous systems. These equations describe the time evolution of the nonequilibrium Green function for interacting many-body systems in the presence of time-dependent external fields. The external fields are treated nonperturbatively whereas the many-body interactions are incorporated perturbatively using Phi-derivable self-energy approximations that guarantee the satisfaction of the macroscopic conservation laws of the system. These approximations are discussed in detail for the time-dependent Hartree-Fock, the second Born and the GW approximation.
Cuvinte cheie: conserving approximations, GW approximation, second order approximation, Hartree-Fock, Second Born approximation, vertex renormalization, self-consistent GW, time-propagation, inhomogeneous systems