Efficient evaluation of the polarization function in dynamical mean-field theory

  title={Efficient evaluation of the polarization function in dynamical mean-field theory},
  author={Friedrich Krien},
  journal={Physical Review B},
  • F. Krien
  • Published 9 January 2019
  • Physics
  • Physical Review B
The dynamical susceptibility of strongly correlated electronic systems can be calculated within the framework of the dynamical mean-field theory (DMFT). The required measurement of the four-point vertex of the auxiliary impurity model is however costly and restricted to a finite grid of Matsubara frequencies, leading to a cutoff error. It is shown that the propagation of this error to the lattice response function can be minimized by virtue of an exact decomposition of the DMFT polarization… 

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