Nonequilibrium self-energy functional theory

  title={Nonequilibrium self-energy functional theory},
  author={Felix Hofmann and Martin Eckstein and Enrico Arrigoni and Michael Potthoff},
  journal={Physical Review B},
The self-energy functional theory (SFT) is generalized to describe the real-time dynamics of correlated lattice-fermion models far from thermal equilibrium. This is achieved by starting from a reformulation of the original equilibrium theory in terms of double-time Green's functions on the Keldysh-Matsubara contour. With the help of a generalized Luttinger-Ward functional, we construct a functional � (� ) which is stationary at the physical (nonequilibrium) self-energyand which yields the grand… Expand

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