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标题：Electron Correlations in Local Effective Potential Theory
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作者：Viraht Sahni ; Xiao-Yin Pan ; Tao Yang 等
期刊名称：Computation
电子版ISSN：2079-3197
出版年度：2016
卷号：4
期号：3
页码：30-40
DOI：10.3390/computation4030030
出版社：MDPI Publishing
摘要：Local effective potential theory, both stationary-state and time-dependent, constitutes the mapping from a system of electrons in an external field to one of the noninteracting fermions possessing the same basic variable such as the density, thereby enabling the determination of the energy and other properties of the electronic system. This paper is a description via Quantal Density Functional Theory (QDFT) of the electron correlations that must be accounted for in such a mapping. It is proved through QDFT that independent of the form of external field, (a) it is possible to map to a model system possessing all the basic variables; and that (b) with the requirement that the model fermions are subject to the same external fields, the only correlations that must be considered are those due to the Pauli exclusion principle, Coulomb repulsion, and Correlation–Kinetic effects. The cases of both a static and time-dependent electromagnetic field, for which the basic variables are the density and physical current density, are considered. The examples of solely an external electrostatic or time-dependent electric field constitute special cases. An efficacious unification in terms of electron correlations, independent of the type of external field, is thereby achieved. The mapping is explicated for the example of a quantum dot in a magnetostatic field, and for a quantum dot in a magnetostatic and time-dependent electric field.
关键词：electron correlations; local effective potential theory in electromagnetic fields; quantal density functional theory; Kohn-Sham density functional theory; Runge-Gross density functional theory electron correlations ; local effective potential theory in electromagnetic fields ; quantal density functional theory ; Kohn-Sham density functional theory ; Runge-Gross density functional theory