Tightened Lieb-Oxford bound for systems of fixed particle number

Autor:	Odashima, Mariana M., Capelle, K., Trickey, S. B.
Rok vydání:	2008
Předmět:	Physics - Chemical Physics Condensed Matter - Materials Science Physics - Atomic Physics
Zdroj:	J. Chem. Theory Comput. 5, 798 (2009)
Druh dokumentu:	Working Paper
Popis:	The Lieb-Oxford bound is a constraint upon approximate exchange-correlation functionals. We explore a non-empirical tightening of that bound in both universal and electron-number-dependent form. The test functional is PBE. Regarding both atomization energies (slightly worsened) and bond lengths (slightly bettered), we find the PBE functional to be remarkably insensitive to the value of the Lieb-Oxford bound. This both rationalizes the use of the original Lieb-Oxford constant in PBE and suggests that enhancement factors more sensitive to sharpened constraints await discovery. Comment: six figures (color)
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0812.3626 Zobrazit plný text záznamu View this record from Arxiv