2014/06/30 by Erik G. C. P. van Loon, E. G. C. P. van Loon, Hartmut Hafermann +4 · 1 citation
Materials Science · Physics and Astronomy · #Charge density wave #Condensed matter physics #Coulomb #Electron #Electronic and Structural Properties of Oxides #Hubbard model #Mean field theory #Physics #Physics of Superconductivity and Magnetism #Plasmon #Polarization (electrochemistry) #Quantum and electron transport phenomena #Quantum electrodynamics #Quantum mechanics #Random phase approximation #Spectral line #Strongly correlated material #Superconductivity #Vertex (graph theory) #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.113.246407
published as Phys. Rev. Lett. 113, 246407 (2014) · 5 pages, 5 figures + appendix (3 pages, 1 figure)
openalex publication_date 2014/12/11 · arxiv created 2014/12/23 · arxiv updated 2014/12/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
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 nonlocal 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 √q behavior. Both features are reminiscent of interaction induced changes found in single-electron spectra of strongly correlated systems.