Interplay of electron-phonon interaction and strong correlations: DMFT+ study
Abstract
We perform investigation of Hubbard model with interaction between strongly correlated conducting electrons on a lattice with Debye phonons. To solve the problem generalized dynamical mean-field DMFT+ method is employed with "external" self-energy ph corresponding to electron-phonon interaction. We present DMFT+ph results for densities of states and kinks in energy dispersions for a variety of model parameters, analyzing the interplay of recently discovered kinks of purely electronic nature and usual phonon kinks in the electronic spectrum.
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