BANDSTRUCTURE AND LOCALIZED DESCRIPTIONS OF NARROW-BAND SYSTEMS

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Abstract

In this note I would like to give some personal views on the relevance of bandstructure treatments of narrow-band systems. At first sight one might think that bandstructure theory is not a very appropriate framework for quasi-localized electrons. Nevertheless, it has been found that density-functional (DF) theory in its modern form gives a rather impressive description of ground-state properties for the majority of systems, not only " in principle " but also in practice via calculations based on the local-density approximation (LDA). I will here discuss some key concepts in DF theory with emphasis on physical significance of the eigenvalues which appear in the DF one-electron-like equations. I will also to some extent discuss the dynamical selfenergy Σ, which describes the " one-electron " excitations reached by adding or removing an electron, although there is very little work done for narrow-band electrons.
Original languageEnglish
Title of host publicationNarrow-Band Phenomena—Influence of Electrons with Both Band and Localized Character
EditorsJohn C. Fuggle, George A. Sawatzky, J. W. Allen
PublisherPlenum (Springer)
Pages81-89
Volume184
ISBN (Print)978-1-4684-5561
Publication statusPublished - 1988

Publication series

Name
Volume184

Subject classification (UKÄ)

  • Condensed Matter Physics

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