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- W2054868904 abstract "The Keldysh boundary problem in a nonequilibrium Falicov-Kimball model in infinite dimensions is studied within the truncated and self-consistent perturbation theories and the dynamical mean-field theory. Within the model the system is started in equilibrium, and later a uniform electric field is turned on. The Kadanoff-Baym-Wagner equations for the nonequilibrium Green's functions are derived and numerically solved. The contributions of initial correlations are studied by monitoring the system evolution. It is found that the initial correlations are essential for establishing the full electron correlations of the system and are independent of the starting time of preparing the system in equilibrium. By examining the contributions of the initial correlations to the electric current and the double occupation, we find that the contributions are small in relation to the total value of those physical quantities when the interaction is weak, and significantly increase when the interaction is strong. The neglect of initial correlations may cause artifacts in the nonequilibrium properties of the system, especially in the strong-interaction case." @default.
- W2054868904 created "2016-06-24" @default.
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- W2054868904 date "2008-09-05" @default.
- W2054868904 modified "2023-09-23" @default.
- W2054868904 title "Initial correlations in a nonequilibrium Falicov-Kimball model" @default.
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- W2054868904 doi "https://doi.org/10.1103/physrevb.78.125103" @default.
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