title: Nonequilibrium superoperator GW equations.
abstract: Hedin's equations [Phys. Rev. 139, 796 (1965)] for the one-particle equilibrium Green's function of a many-electron system are generalized to nonequilibrium open systems using two fields that separately control the evolution of the bra and the ket of the density matrix. A closed hierarchy is derived for the Green's function, the self-energy, the screened potential, the polarization, and the vertex function, all expressed as Keldysh matrices in Liouville space.
authors.affiliation: Department of Chemistry, University of California, Irvine, California 92697-2025, USA. uharbola@uci.edu
authors.forename: Upendra
authors.initials: U
authors.lastname: Harbola
authors.forename: Shaul
authors.initials: S
authors.lastname: Mukamel