Tackling nonlocal electronic correlations with the dynamical vertex approximation
The dynamical mean-field theory (DMFT), in combination with density functional theory (DFT), has been developed into a powerful computational tool for materials with strong electronic correlations. Nevertheless, DMFT is based on the solution of a quantum impurity model and can account only for local electronic correlations. Diagrammatic extensions of DMFT such as the dynamical vertex approximation (DΓA) are attempting to include nonlocal correlations and long-range Coulomb interactions.