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Abstract: The Keldysh boundary problem in a nonequilibrium Falicov-Kimball model ininfinite dimensions is studied within the truncated and self-consistentperturbation theories, and the dynamical mean-field theory.
Within the modelthe system is started in equilibrium, and later a uniform electric field isturned on.
The Kadanoff-Baym-Wagner equations for the nonequilibrium Greenfunctions are derived, and numerically solved.
The contributions of initialcorrelations are studied by monitoring the system evolution.
It is found thatthe initial correlations are essential for establishing full electroncorrelations of the system and independent on the starting time of preparingthe system in equilibrium.
By examining the contributions of the initialcorrelations to the electric current and the double occupation, we find thatthe contributions are small in relation to the total value of those physicalquantities when the interaction is weak, and significantly increase when theinteraction is strong.
The neglect of initial correlations may cause artifactsin the nonequilibrium properties of the system, especially in the stronginteraction case.



Author: Minh-Tien Tran

Source: https://arxiv.org/



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