Basic idea of nonequilibrium Greens functions

(Kadanoff-Baym equations)

Spectral function of correlated electrons in the two-time plane

Electron spectral function (Schematic overview)

Picture from M. Bonitz, Quantum Kinetic Theory

Kadanoff-Baym equations | See solutions: time evolution of the Greens functions
KB equations for laser excited electrons in semiconductors

Here is a Collection of recent review articles on nonequilibrium Greens functions
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