• Corpus ID: 18691418

Green's Functions for the Anderson model: the Atomic Approximation

@article{Foglio2009GreensFF,
  title={Green's Functions for the Anderson model: the Atomic Approximation},
  author={Mario E. Foglio and Thiago Lobo and M. S. Figueira Ifgw Unicamp Campinas Brasil and IF Uff Niter'oi RJ Brazil},
  journal={arXiv: Strongly Correlated Electrons},
  year={2009}
}
We consider the cumulant expansion of the PAM employing the hybridization as perturbation (Phys. Rev. B 50, 17933 (1994)), and we obtain formally exact one-electron Green's functions (GF). These GF contain effective cumulants that are as difficult to calculate as the original GF, and the Atomic Approximation consists in substituting the effective cumulants by the ones that correspond to the atomic case, namely by taking a conduction band of zeroth width and local hybridization. This… 
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