Metallic State of the Three-band Hubbard Model with Super-lattice Structure

TL;DR

This paper explores the metallic state in a three-band Hubbard model with superlattice structure, revealing how inhomogeneous electron distributions influence spectral and correlation functions, aligning with experimental observations.

Contribution

It introduces an analysis of the three-band Hubbard model with superlattice structure using the unrestricted fluctuation exchange approximation, highlighting inhomogeneous electron effects.

Findings

Reproduction of experimental results through inhomogeneous Cu 3d electron distribution

Identification of instabilities with spatial inhomogeneities affecting spectral functions

Evidence of various instabilities influencing electronic properties

Abstract

We investigate the dynamical superlattice correlation in the two-dimensional three-band Hubbard model on the basis of the unrestricted fluctuation exchange approximation. We calculate the one-particle spectral function, the spin correlation function and the charge correlation function at finite temperature. We find that some experimental results can be reproduced consistenly by taking inhomogenous distribution of Cu 3d electrons into account. The correlation functions suggest that several kinds of instabilities with spatial inhomogenieties exist in some regions, where these instabilities significantly affect the one-particle spectral fuctions.