Nonresonant inelastic light scattering in the Hubbard model

TL;DR

This paper provides an exact theoretical analysis of nonresonant inelastic light scattering in the Hubbard model's correlated metallic phase, revealing features observable in experiments on heavy fermion materials.

Contribution

It offers the first exact large-dimensional solutions for B1g Raman and inelastic X-ray responses in doped Hubbard models, advancing understanding of charge dynamics in correlated metals.

Findings

Exact solutions for Raman response in the Hubbard model

Identification of features in light scattering spectra of correlated metals

Potential experimental observables in heavy fermion systems

Abstract

Inelastic light scattering from electrons is a symmetry-selective probe of the charge dynamics within correlated materials. Many measurements have been made on correlated insulators, and recent exact solutions in large dimensions explain a number of anomalous features found in experiments. Here we focus on the correlated metal, as described by the Hubbard model away from half filling. We can determine the B1g Raman response and the inelastic X-ray scattering along the Brillouin zone diagonal exactly in the large dimensional limit. We find a number of interesting features in the light scattering response which should be able to be seen in correlated metals such as the heavy fermions.