Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 78: Electronic Structure Theory: New Concepts and Developments in Density Functional Theory and Beyond - V
O 78.10: Talk
Wednesday, March 22, 2017, 17:15–17:30, GER 38
From the Electron Localization Function to a Coalescent-Pair Locator — •Stefano Pittalis1, Daniele Varsano1, Alain Delgado2,3, and Carlo Andrea Rozzi1 — 1Istituto Nanoscienze, Consiglio Nazionale dellle Ricerche, Via Campi 213a, 41125 Modena, Italy — 2Department of Physics, University of Ottawa, Ottawa, ON K1N 6N5, Canada — 3Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear, Calle 30 # 502, 11300 La Habana, Cuba
The Electron Localization Function (ELF), as proposed originally by Becke and Edgecombe, uses the information on the distribution of pairs of electrons with parallel spins. The ELF has been widely adopted as a descriptor of atomic shells and covalent bonds, but it is not useful to visualize the bond in H2 – the simplest neutral molecule in the universe. Here we propose a complementary descriptor which also works for H2 by exploiting the information on pairs of electrons with opposite spins. Remarkably, only quantities derived from occupied single-particle orbitals are required in the calculations. If time allows, implications for developing improved approximate density functionals will also be discussed.