Poor Man's Understanding of Kinks Originating from Strong Electronic Correlations

TL;DR

This paper explains the origin of kinks in strongly correlated electronic systems as an effective Kondo energy scale, using dynamical mean field theory and renormalization group methods, clarifying a previously unclear physical mechanism.

Contribution

It identifies the physical origin of kinks in correlated systems as the Kondo energy scale, providing a theoretical understanding of these features.

Findings

Kinks arise from the effective Kondo energy scale.

The Kondo scale is smaller than the width of the central peak.

The study combines dynamical mean field theory with renormalization group analysis.

Abstract

By means of dynamical mean field theory calculations, it was recently discovered that kinks generically arise in strongly correlated systems, even in the absence of external bosonic degrees of freedoms such as phonons. However, the physical mechanism behind these kinks remained unclear. On the basis of the perturbative and numerical renormalization group theory, we herewith identify these kinks as the effective Kondo energy scale of the interacting lattice system which is shown to be smaller than the width of the central peak.