A calculation scheme for spectral densities of strongly correlated electron systems using exact diagonalization of dynamical mean field theory

TL;DR

This paper introduces a novel method for calculating spectral densities in strongly correlated electron systems using an improved exact diagonalization approach within DMFT, providing more realistic spectral shapes and applying it to study the Mott transition.

Contribution

It presents a new analytic continuation technique for spectral densities in DMFT that enhances the realism of spectral shapes compared to traditional methods.

Findings

More accurate spectral density functions obtained

Successful application to Mott transition analysis

Improved spectral shape realism

Abstract

A new approach for calculating spectral density functions of strongly correlated electron systems is proposed within the exact diagonalization method of dynamical mean-field theory (DMFT). This approach is based on the analytic continuation of spectral density function obtained by conventional exact diagonalization method of DMFT and its results are more reasonable in shape. As an example of its application, the Mott transition in a strongly correlated electron system is investigated using this new approach.