A New Iterative Perturbation Scheme for Lattice Models with Arbitrary Filling

TL;DR

This paper introduces a novel iterative perturbation method for lattice models at any filling level, demonstrating its effectiveness through comparison with exact diagonalization data for the Hubbard model.

Contribution

A new perturbation scheme for large d lattice models at arbitrary filling, expanding analytical tools for complex many-body systems.

Findings

Good agreement with exact diagonalization data

Effective for large d limit

Applicable at arbitrary filling levels

Abstract

We derive a new perturbation scheme for treating the large d limit of lattice models at arbitrary filling. The results are compared with exact diagonalization data for the Hubbard model and found to be in good agreement.