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• W2565386446 abstract "Local n-particle vertex functions represent the crucial ingredient for all diagrammatic extensions of dynamical mean field theory (DMFT). Hitherto their application has been restricted -with a few exceptions- to the n=2-particle vertex while higher-order vertices have been neglected. In this paper we derive a general analytical expression for the n-particle (one-particle reducible) vertex of the Falicov-Kimball model (FKM). We observe that the magnitude of such vertex functions itself strongly increases with the particle-number n. On the other hand, their effect on generic Feynman diagrams remains rather moderate due to the damping effect of the Green's functions present in such diagrams. Nevertheless, they yield important contributions to the self-energy corrections calculated in diagrammatic extensions of DMFT as we explicitly demonstrate using the example of dual fermion (DF) calculations for the two-dimensional FKM at quarter filling of stationary f-electrons where corrections to the self-energy obtained from the three-particle vertex are indeed comparable in magnitude to corresponding corrections stemming from the two-particle vertex." @default.
• W2565386446 created "2017-01-06" @default.
• W2565386446 creator A5043378891 @default.
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• W2565386446 date "2017-04-18" @default.
• W2565386446 modified "2023-09-25" @default.
• W2565386446 title "Local correlation functions of arbitrary order for the Falicov-Kimball model" @default.
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• W2565386446 doi "https://doi.org/10.1103/physrevb.95.155130" @default.
• W2565386446 hasPublicationYear "2017" @default.
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