Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-08-24
Phys. Rev. B 78, 125103 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1103/PhysRevB.78.125103
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 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 full electron correlations of the system and independent on 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.
No associations
LandOfFree
Initial correlations in nonequilibrium Falicov-Kimball model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Initial correlations in nonequilibrium Falicov-Kimball model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Initial correlations in nonequilibrium Falicov-Kimball model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-535606