On the ground state of solids with strong electron correlations

TL;DR

This paper introduces a new method using scattering matrices to calculate the ground-state properties of strongly correlated electron systems, extending previous approaches for weak correlations.

Contribution

It presents a hierarchical approximation framework that generalizes earlier methods, enabling better analysis of strongly correlated electrons.

Findings

Hierarchical approximation improves accuracy for strongly correlated systems

Incremental energy expansion offers a systematic computational approach

Method extends applicability beyond weakly correlated electronic systems

Abstract

We formulate the calculation of the ground-state wavefunction and energy of a system of strongly correlated electrons in terms of scattering matrices. A hierarchy of approximations is introduced which results in an incremental expansion of the energy. The present approach generalizes previous work designed for weakly correlated electronic systems.