Polaronic Quasiparticles in a Strongly Correlated Electron Band

Abstract

We show that a strongly renormalized band of polaronic quasiparticle excitations is induced at the Fermi level of an interacting many-electron system on increasing the coupling of the electrons to local phonons. We give results for the local density of states at zero temperature both for the electrons and phonons. The polaronic quasiparticles satisfy Luttinger's theorem for all regimes considered, and their dispersion shows a kink similar to that observed experimentally in copper oxides. We calculate the quasiparticle weight factor $z$ and deduce the local effective inter-quasiparticle interaction $\tilde{U}$. Our calculations are based on the dynamical mean field theory and the numerical renormalization group for the hole-doped Holstein-Hubbard model and large on-site repulsion.

4 pages, 8 figures

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• Magnetic Field Effects on Quasiparticles in Strongly Correlated Local Systems
• Competition between antiferromagnetic and charge order in the Hubbard-Holstein model
• Relevance of phonon dynamics in strongly correlated systems coupled to phonons: A Dynamical Mean Field Theory analysis
• Spectral signatures of the Luttinger liquid to charge-density-wave transition
• Competing interactions and symmetry breaking in the Hubbard-Holstein model
• Interplay of electron-phonon interaction and strong correlations: DMFT+Σstudy
• A comparative study of nonequilibrium insulator-to-metal transitions in electron-phonon systems
• Low-energy kink in the nodal dispersion of copper-oxide superconductors: Insights from Dynamical Mean Field Theory
• Diagrammatic content of the DMFT for the Holstein polaron problem in finite dimensions
• Periodic Anderson model with electron-phonon correlated conduction band
• Numerical Renormalization Group Study of Probability Distributions for Local Fluctuations in the Anderson-Holstein and Holstein-Hubbard Models
• Interplay of electron-phonon interaction and strong correlations: DMFT+Sigma approach
• Quantum phase transition between antiferromagnetic and charge order in the Hubbard-Holstein model