Isosbestic points in the spectral function of correlated electrons

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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.
16 pages, 5 figures

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/130328

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0609464
 http://arxiv.org/abs/cond-mat/0609464
 J. Low Temp. Phys. 147, 279 (2007)
 doi:10.1007/s10909-007-9311-3

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arXiv