Low-Energy Models for Correlated Materials: Bandwidth Renormalization from Coulombic Screening

M. Casula (1) , Ph. Werner (2) , L. Vaugier (3, 4) , F. Aryasetiawan (5) , T. Miyake (4, 6) , A. J. Millis (7) , S. Biermann (3, 4)

1 IMPMC - Institut de minéralogie et de physique des milieux condensés
2 Department of Physics, University of Fribourg
3 CPHT - Centre de Physique Théorique [Palaiseau]
4 Japan Science and Technology Agency
5 Skane University Hospital [Lund]
6 Nanosystem Research Institute (NRI)
7 Department of Physics, Columbia University

We provide a prescription for constructing Hamiltonians representing the low-energy physics of correlated electron materials with dynamically screened Coulomb interactions. The key feature is a renormalization of the hopping and hybridization parameters by the processes that lead to the dynamical screening. The renormalization is shown to be non-negligible for various classes of correlated electron materials. The bandwidth reduction effect is necessary for connecting models to materials behavior and for making quantitative predictions for low-energy properties of solids.

Domaines: Physique Quantique [quant-ph]

M. Casula, Ph. Werner, L. Vaugier, F. Aryasetiawan, T. Miyake, et al.. Low-Energy Models for Correlated Materials: Bandwidth Renormalization from Coulombic Screening. Physical Review Letters, 2012, 109, pp.126408. ⟨10.1103/PhysRevLett.109.126408⟩. ⟨hal-00796598⟩