Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2000-11-15
Physics
Condensed Matter
Strongly Correlated Electrons
35 pages, 15 figures
Scientific paper
The strong-coupling perturbation theory (SCPT) for correlated electron systems is extended to the case of full Coulomb interaction. The Coulomb mechanism of the orbital polarization is discussed and attention is paid to the importance of spectral weight transfer between the localized and delocalized subsystems of electrons. A one-to-one correspondence between subsets of Feynman graphs of SCPT (which we name the approximation of renormalized Fermions (ARF)) and weak-coupling perturbation theory (WCPT) is established. The comparison of the Galitskii and Migdal expression for the total energy and the Sham equation (which connects the self-energy and the exchange-correlation potential in density functional theory) for WCPT with the ones for the systems with strong electron correlations is used for the formulation of a simple theory for extending the local density approximation to density functional theory (DFT) to include explicitly correlations. The extension requires the inclusion of the many-electron spectral weights in the definition of the charge density and the renormalization of the mixing and hopping matrix elements caused by many body effects.
Eriksson Olle
Lundin Urban
Sandalov Igor
No associations
LandOfFree
Theory of Strongly Correlated Electron Systems. II.Intersite Coulomb Interaction and the Approximation of Renormalized Fermions in Total Energy Calculations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Theory of Strongly Correlated Electron Systems. II.Intersite Coulomb Interaction and the Approximation of Renormalized Fermions in Total Energy Calculations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Theory of Strongly Correlated Electron Systems. II.Intersite Coulomb Interaction and the Approximation of Renormalized Fermions in Total Energy Calculations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-250900