Journal article

Extended dynamical mean-field study of the Hubbard model with long-range interactions

  • Huang, Li Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland
  • Ayral, Thomas Centre de Physique Théorique, Ecole Polytechnique, CNRS-UMR7644, 91128 Palaiseau, France - Institut de Physique Théorique (IPhT), CEA, CNRS, URA 2306, 91191 Gif-sur-Yvette, France
  • Biermann, Silke Centre de Physique Théorique, Ecole Polytechnique, CNRS-UMR7644, 91128 Palaiseau, France - Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France
  • Werner, Philipp Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland
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    10.11.2014
Published in:
  • Physical Review B. - 2014, vol. 90, no. 19, p. 195114
English Using extended dynamical mean-field theory and its combination with the GW approximation, we compute the phase diagrams and local spectral functions of the single-band extended Hubbard model on the square and simple cubic lattices, considering long-range interactions up to the third nearest neighbors. The longer-range interactions shift the boundaries between the metallic, charge-ordered insulating, and Mott insulating phases, and lead to characteristic changes in the screening modes and local spectral functions. Momentum-dependent self-energy contributions enhance the correlation effects and thus compete with the additional screening effect from longer-range Coulomb interactions. Our results suggest that the influence of longer-range intersite interactions is significant, and that these effects deserve attention in realistic studies of correlated materials.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
  • English
Classification
Physics
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/304255
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