Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-09-02
Physica E 42, 1236 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
Scientific paper
10.1016/j.physe.2009.11.126
We study the properties of the lower bound on the exchange-correlation energy in two dimensions. First we review the derivation of the bound and show how it can be written in a simple density-functional form. This form allows an explicit determination of the prefactor of the bound and testing its tightness. Next we focus on finite two-dimensional systems and examine how their distance from the bound depends on the system geometry. The results for the high-density limit suggest that a finite system that comes as close as possible to the ultimate bound on the exchange-correlation energy has circular geometry and a weak confining potential with a negative curvature.
Capelle Klaus
Pittalis Stefano
Proetto Cesar R.
Rasanen Esa
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