Isosbestic points in the spectral function of correlated electrons
Strongly Correlated Electrons
2007-06-13 v1
Abstract
We investigate the properties of the spectral function A(omega,U) of correlated electrons within the Hubbard model and dynamical mean-field theory. Curves of A(omega,U) vs. omega 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.
Keywords
Cite
@article{arxiv.cond-mat/0609464,
title = {Isosbestic points in the spectral function of correlated electrons},
author = {M. Eckstein and M. Kollar and D. Vollhardt},
journal= {arXiv preprint arXiv:cond-mat/0609464},
year = {2007}
}
Comments
16 pages, 5 figures