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Bandstructure and Localized Descriptions of Narrow-Band Systems

  • C.-O. Almbladh
Part of the NATO ASI Series book series (NSSB, volume 184)

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 quasilocalized 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.

Keywords

Fermi Surface Anderson Impurity Model Band Description Free Carrier State Bandstructure Theory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • C.-O. Almbladh
    • 1
  1. 1.Department of Theoretical PhysicsLund UniversityLundSweden

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