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

Huang, Li; Ayral, Thomas; Biermann, Silke; Werner, Philipp

doi:10.1103/PhysRevB.90.195114

Back

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

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