Spectral moment sum rules for strongly correlated electrons in time-dependent electric fields
Strongly Correlated Electrons
2009-11-11 v1 Statistical Mechanics
Abstract
We derive exact operator average expressions for the first two spectral moments of nonequilibrium Green's functions for the Falicov-Kimball model and the Hubbard model in the presence of a spatially uniform, time-dependent electric field. The moments are similar to the well-known moments in equilibrium, but we extend those results to systems in arbitrary time-dependent electric fields. Moment sum rules can be employed to estimate the accuracy of numerical calculations; we compare our theoretical results to numerical calculations for the nonequilibrium dynamical mean-field theory solution of the Falicov-Kimball model at half-filling.
Keywords
Cite
@article{arxiv.cond-mat/0511063,
title = {Spectral moment sum rules for strongly correlated electrons in time-dependent electric fields},
author = {V. M. Turkowski and J. K. Freericks},
journal= {arXiv preprint arXiv:cond-mat/0511063},
year = {2009}
}
Comments
(16 pages, submitted to Phys. Rev. B)