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Journal of Low Temperature Physics

, Volume 147, Issue 3–4, pp 279–293 | Cite as

Isosbestic Points in the Spectral Function of Correlated Electrons

  • Martin Eckstein
  • Marcus Kollar
  • Dieter VollhardtEmail author
Article

We investigate the properties of the spectral function A(ω,U) of correlated electrons within the Hubbard model and dynamical mean-field theory. Curves of A(ω,U) versus ω for different values of the interaction U are found to intersect near the band-edges of the non-interacting system. For a wide range of U the crossing points are located within a sharply confined region. The precise location of these “isosbestic points” depends on details of the non-interacting band structure. Isosbestic points of dynamic quantities therefore provide valuable insights into microscopic energy scales of correlated systems.

PACS Numbers

71.27.+a. 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Martin Eckstein
    • 1
  • Marcus Kollar
    • 1
  • Dieter Vollhardt
    • 1
    Email author
  1. 1.Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute for PhysicsUniversity of AugsburgAugsburgGermany

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