Plasmons in strongly correlated systems: spectral weight transfer and renormalized dispersion

Abstract

We study the charge-density dynamics within the two-dimensional extended Hubbard model in the presence of long-range Coulomb interaction across the metal-insulator transition point. To take into account strong correlations we start from self-consistent extended dynamical mean-field theory and include non-local dynamical vertex corrections through a ladder approximation to the polarization operator. This is necessary to fulfill charge conservation and to describe plasmons in the correlated state. The calculated plasmon spectra are qualitatively different from those in the random-phase approximation: they exhibit a spectral density transfer and a renormalized dispersion with enhanced deviation from the canonical $\sqrt{q}$-behavior. Both features are reminiscent of interaction induced changes found in single-electron spectra of strongly correlated systems.

5 pages, 5 figures + appendix (3 pages, 1 figure)

References in corpus (8)

• Graphene plasmonics
• Electrodynamics of Correlated Electron Materials
• Dynamical vertex approximation - a step beyond dynamical mean field theory
• Screening and Non-local Correlations in the Extended Hubbard Model from Self-Consistent Combined GW and Dynamical Mean Field Theory
• Spectral Properties of Correlated Materials: Local Vertex and Non-Local Two-Particle Correlations from Combined GW and Dynamical Mean Field Theory
• Efficient implementation of the continuous-time hybridization expansion quantum impurity solver
• Collective Charge Excitations of Strongly Correlated Electrons, Vertex Corrections and Gauge Invariance
• Momentum-dependent pseudogaps in the half-filled two-dimensional Hubbard model

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