Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-05-28
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
36 pages, 3 figures. to be published in Physics Reports
Scientific paper
10.1016/j.physrep.2008.05.003
Nonequilibrium Green's functions provide a powerful tool for computing the dynamical response and particle exchange statistics of coupled quantum systems. We formulate the theory in terms of the density matrix in Liouville space and introduce superoperator algebra that greatly simplifies the derivation and the physical interpretation of all quantities. Expressions for various observables are derived directly in real time in terms of superoperator nonequilibrium Green's functions (SNGF), rather than the artificial time-loop required in Schwinger's Hilbert-space formulation. Applications for computing interaction energies, charge densities, average currents, current induced fluorescence, electroluminescence and current fluctuation (electron counting) statistics are discussed.
Harbola Upendra
Mukamel Shaul
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