Low-energy models for correlated materials: bandwidth renormalization from Coulombic screening

TL;DR

This paper introduces a method to construct low-energy Hamiltonians for correlated materials by incorporating bandwidth renormalization due to Coulombic screening, improving the accuracy of models in predicting material behavior.

Contribution

It presents a new prescription for including dynamical screening effects in Hamiltonians through bandwidth renormalization, enhancing the modeling of correlated electron materials.

Findings

Bandwidth reduction is significant across various correlated materials.

Renormalization improves the connection between models and experimental observations.

The method enables more accurate predictions of low-energy properties.

Abstract

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.