Nonequilibrium dynamical mean-field theory of a strongly correlated system
Abstract
We present a generalized dynamical mean-field approach for the nonequilibrium physics of a strongly correlated system in the presence of a time-dependent external field. The Keldysh Green's function formalism is used to study the nonequilibrium problem. We derive a closed set of self-consistency equations in the case of a driving field with frequency Omega and wave vector q. We present numerical results for the local frequency-dependent Green's function and the self-energy for different values of the field amplitude in the case of a uniform external field using the iterated perturbation theory. In addition, an expression for the frequency-dependent optical conductivity of the Hubbard model with a driving external field is derived.
Keywords
Cite
@article{arxiv.cond-mat/0202046,
title = {Nonequilibrium dynamical mean-field theory of a strongly correlated system},
author = {P. Schmidt and H. Monien},
journal= {arXiv preprint arXiv:cond-mat/0202046},
year = {2007}
}
Comments
4 pages, 7 figures