Dresden 2020 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 47: Poster Session Correlated Electrons 2

TT 47.24: Poster

Wednesday, March 18, 2020, 15:00–19:00, P2/3OG

Efficient ladder dual fermion calculations from a three-leg vertex — •Viktor Harkov^1,2, 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.