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TT: Fachverband Tiefe Temperaturen
TT 47: Poster Session Correlated Electrons 2
TT 47.24: Poster
Mittwoch, 18. März 2020, 15:00–19:00, P2/3OG
Efficient ladder dual fermion calculations from a three-leg vertex — •Viktor Harkov1,2, Angelo Valli3, Alexander I. Lichtenstein1, and Friedrich Krien4 — 1Institute of Theoretical Physics, University of Hamburg, 20355 Hamburg, Germany — 2European X-Ray Free-Electron Laser Facility, 22869 Schenefeld, Germany — 3Institute for Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria — 4Institut Jožef Stefan, Ljubljana, Slovenia
The calculation of the dynamical susceptibility within the dynamical mean-field theory requires the numerically expensive measurement of the vertex function of the auxiliary Anderson impurity model. We investigate an optimal parametrization of the vertex in terms of single-boson exchange (SBE). The approximation lowers the cost of ladder dual fermion calculations to a level comparable with the TRILEX approach.