Gap to Transition Temperature Ratio in Density Wave Ordering: a Dynamical Mean Field Study

TL;DR

This study employs dynamical mean-field theory to explain the large ratio of zero-temperature gap to transition temperature in charge density wave materials, attributing it to strong inelastic scattering effects.

Contribution

It provides a novel dynamical mean-field approach to understanding the origin of large gap-to-transition temperature ratios in density wave systems.

Findings

Large gap-to-transition temperature ratio is due to strong inelastic scattering.

Dynamical mean-field results relate to conventional diagrammatic methods.

Thermal fluctuations are exactly treated in the analysis.

Abstract

We use the dynamical mean-field method to determine the origin of the large ratio of the zero temperature gap to the transition temperature observed in most charge density wave materials. The method is useful because it allows an exact treatment of thermal fluctuations. We establish the relation of the dynamical mean-field results to conventional diagrammatics and thereby determine that in the physically relevant regime the origin of the large ratio is a strong inelastic scattering.