Interplay of electron-phonon interaction and strong correlations: DMFT+Σstudy

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+Σmethod is employed with "external" self-energy Σ_ph corresponding to electron-phonon interaction. We present DMFT+Σ_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.

6 pages, 8 figures

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• Disorder Effects in BCS-BEC Crossover Region of Attractive Hubbard Model
• Interplay of electron-phonon interaction and strong correlations: DMFT+Sigma approach
• Ginzburg - Landau Expansion in BCS - BEC Crossover Region of Disordered Attractive Hubbard Model
• DMFT+Sigma approach to disordered Hubbard model
• ARPES spectral functions and Fermi surface for La(1.86)Sr(0.14)CuO(4) compared with LDA+DMFT+Sk calculations