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One- and Two-Particle Excitations in Doped Mott-Hubbard Insulators

  • P. Horsch
  • W. Stephan
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 113)

Abstract

Recent analytical and numerical results for the single-particle spectral function and the optical conductivity of two-dimensional Hubbard and t-J models are reviewed. These models are considered relevant for the copper-oxide superconductors which are usually classified as doped charge-transfer insulators. We shall (1) briefly discuss based on a study of the 3-band Hubbard model why the charge-transfer gap and the low-lying excitations of the doped systems may be described by the more simple 1-band Hubbard model, which reduces in the strong coupling limit to the t-J model. The subsequent discussion covers the following topics: (2) the Green’s function for a single hole in the t—J model, (3) the suppression of staggered magnetization at small doping concentration as a result of the motion of the holes, (4) the spectral function and Fermi surface at moderate doping, i.e in the spin liquid phase, and (5) the doping dependence of the optical conductivity.

Keywords

Spin Wave Hubbard Model Optical Conductivity Exact Diagonalization Doping Dependence 
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Copyright information

© Springer-Verlag Berlin, Heidelberg 1993

Authors and Affiliations

  • P. Horsch
    • 1
  • W. Stephan
    • 2
  1. 1.Max-Planck-Institut für FestkörperforschungStuttgart 80Fed. Rep. of Germany
  2. 2.King’s College LondonLondonUK

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