Current-dependent exchange-correlation potential for dynamical linear response theory
凝聚态物理
2009-10-28 v1
摘要
The frequency-dependent exchange-correlation potential, which appears in the usual Kohn-Sham formulation of a time-dependent linear response problem, is a strongly nonlocal functional of the density, so that a consistent local density approximation generally does not exist. This problem can be avoided by choosing the current-density as the basic variable in a generalized Kohn-Sham theory. This theory admits a local approximation which, for fixed frequency, is exact in the limit of slowly varying densities and perturbing potentials.
引用
@article{arxiv.cond-mat/9605052,
title = {Current-dependent exchange-correlation potential for dynamical linear response theory},
author = {G. Vignale and Walter Kohn},
journal= {arXiv preprint arXiv:cond-mat/9605052},
year = {2009}
}
备注
10 pages