Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Poster Session: Correlated Electrons 1
TT 19.7: Poster
Montag, 20. März 2017, 15:00–19:00, P2-EG
Ward identities versus two-particle self-consistency — •Friedrich Krien1, Erik G.C.P. van Loon2, Hartmut Hafermann3, Alexander I. Lichtenstein1, and Mikhail I. Katsnelson2 — 1Institute of Theoretical Physics, University of Hamburg, 20355 Hamburg, Germany — 2Radboud University, Institute for Molecules and Materials, NL-6525 AJ Nijmegen, The Netherlands — 3Mathematical and Algorithmic Sciences Lab, France Research Center, Huawei Technologies Co. Ltd., 92100 Boulogne Billancourt, France
Some diagrammatic extensions of (E)DMFT (EDMFT+GW, Trilex, Dual Boson and others) introduce retarded interactions into the Anderson-Impurity model to fix a two-particle self-consistency condition. We take a close look at the fate of conservation laws under this pretext and demonstrate that Φ-derivability à la Baym-Kadanoff is not a sufficient criterion for spin conservation. We propose direct numerical validation to verify Ward identities.