Superoperator Many-body Theory of Molecular Currents: Non-equilibrium Green Functions in Real Time
U. Harbola, S. Mukamel
Abstract
The electric conductance of a molecular junction is calculated by recasting the Keldysh formalism in Liouville space. Dyson equations for nonequilibrium many body Green's functions (NEGF) are derived directly in real (physical) time. The various NEGFs appear naturally in the theory as time ordered products of superoperators, while the Keldysh forward/backward time loop is avoided.
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