Self-energy method for time-dependent spectral functions of the Anderson impurity model within the time-dependent numerical renormalization group approach

@article{Nghiem2021SelfenergyMF,
  title={Self-energy method for time-dependent spectral functions of the Anderson impurity model within the time-dependent numerical renormalization group approach},
  author={H. T. M. Nghiem and Theo A. Costi},
  journal={Physical Review B},
  year={2021}
}
The self-energy method for quantum impurity models expresses the correlation part of the self-energy in terms of the ratio of two Green’s functions and allows for a more accurate calculation of equilibrium spectral functions than is possible directly from the one-particle Green’s function [Bulla et al., J. Phys.: Condens. Matter 10, 8365 (1998)], for example, within the numerical renormalization group method. In addition, the self-energy itself is a central quantity required in the dynamical… Expand

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