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Volume 86, Number 4, May 2009
Article Number 40004
Number of page(s) 5
Section General
Published online 05 June 2009
EPL, 86 (2009) 40004
DOI: 10.1209/0295-5075/86/40004

On the scaling properties of the correlation term of the electron kinetic functional and its relation to the Shannon measure

L. Delle Site

Max-Planck-Institute for Polymer Research - Ackermannweg 10, D 55021 Mainz Germany, EU

received 6 April 2009; accepted in final form 30 April 2009; published May 2009
published online 5 June 2009

In a previous work (GHIRINGHELLI L. M. and DELLE SITE L., Phys. Rev. B, 77 (2008) 073104) we have proposed a methodological approach to determine the electron correlations contained in the kinetic functional. Its application to the test case of an almost uniform interacting electron gas led to a local density functional of the form $\int \rho ({\bf r}){\rm ln}\rho ({\bf r}){\rm d}{\bf r}$. In this work we discuss the interpretation of such a result by performing an analysis of the formal and numerical properties of the functional under the process of coordinates' scaling. On the basis of such an analysis we propose a local analytic form of the kinetic functional of which the previous numerical result is a first-order approximation.

03.65.-w - Quantum mechanics.
71.10.-w - Theories and models of many-electron systems.
71.15.Mb - Density functional theory, local density approximation, gradient and other corrections.

© EPLA 2009