Impurity scattering in strongly correlated metals close to the Mott transition

TL;DR

This paper presents an approximation method combining scattering theory and DMFT to analyze impurity effects in strongly correlated metals near the Mott transition, aiding experimental interpretation.

Contribution

It introduces a simple, exact-in-limits approximation for impurity scattering in correlated metals near the Mott transition, bridging theory and experiments.

Findings

Original electronic structure emerges at moderate impurity potentials.

Approximation is exact in weak and strong impurity potential limits.

Results assist in interpreting STM experiments in correlated systems.

Abstract

This work explores a simple approximation to describe isolated impurity scattering in a strongly correlated metal. The approximation combines conventional one electron scattering theory and the Dynamic Mean Field Theory to describe strong correlations in the host. It becomes exact in several limits, including those of very weak and very strong impurity potentials. Original electronic structure appears at the impurity site when the impurity potential strength is moderate and the host is close to the Mott transition. Our results may provide useful guidance for interpretation of scanning tunneling microscopy experiments in strongly correlated systems.