Date(s) - 28/01/2008
3:30 pm - 4:30 pm
Title: Nearsightedness of Electronic Matter
Speaker: Dr. Walter Kohn
Institute: University of California
Nobel Prize, Chemistry, 1998 (with Pople)
Location: MDCL 1309
Nearsightedness of Electronic Matter”(NEM)* is a general principle which can be viewed as underpinning such broad chemical concepts as the localized chemical bond and transferability, between two different multi-atomic systems, of common subsystems. Roughly speaking, and neglecting the Coulomb repulsion between the electrons, NEM addresses the question of the effect on the electronic structure near a point r of a distant potential perturbation, w(r’), especially the decrease of the effect as function of the distance d between r and r’.
A quantitative formulation and several illustrations for gapped and ungapped systems will be presented. The modifications of NEM due to the long-range Coulomb interactions between electrons will also be discussed.