Ayral, Thomas Biermann, Silke Werner, Philipp Boehnke, Lewin 2017-06-23 In electronic systems with long-range Coulomb interaction, the nonlocal Fock- exchange term has a band-widening effect. While this effect is included in combined many-body perturbation theory and dynamical mean field theory (DMFT) schemes, it is not taken into account in standard extended DMFT (EDMFT) calculations. Here, we include this instantaneous term in both approaches and investigate its effect on the phase diagram and dynamically screened interaction. We show that the largest deviations between previously presented EDMFT and GW+EDMFT results originate from the nonlocal Fock term, and that the quantitative differences are especially large in the strong-coupling limit. Furthermore, we show that the charge-ordering phase diagram obtained in GW+EDMFT methods for moderate interaction values is very similar to the one predicted by dual-boson methods that include the fermion-boson or four-point vertex. application/pdf https://folia.unifr.ch/global/documents/306142 https://folia.unifr.ch/documents/306142/files/wer_ife.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1103/PhysRevB.95.245130 info:eu-repo/semantics/openAccess License undefined Physical Review B. - 2017, vol. 95, no. 24, p. 245130 info:eu-repo/classification/udc/53 Influence of Fock exchange in combined many-body perturbation and dynamical mean field theory http://purl.org/coar/resource_type/c_6501