Redistribution of the Hole Spectral Weight due to Long-Range Spin Correlations in the Three-Band Hubbard Model

TL;DR

This paper investigates how long-range spin correlations in the three-band Hubbard model affect the hole spectral weight distribution, revealing significant changes in the polaron band structure relevant to high-temperature superconductors.

Contribution

It introduces a detailed analysis of the coupling between local polarons and antiferromagnetic spin waves, highlighting their impact on the spectral properties in the three-band model.

Findings

Significant redistribution of the hole spectral weight due to spin correlations

Altered dispersion of the lowest polaron band E(k)

Enhanced understanding of spectral features in high-Tc cuprates

Abstract

In the framework of the three-band model for CuO_2 plane in high-temperature superconductors the spectrum of the spin-polaron hole exitation is investigated. The problem is treated taking into account the coupling of a local polaron with the antiferromagnetic spin wave with Q=(pi,pi). This leads to the essential changes of the lowest polaron band E(k) and the strong redistribution of the bare electron filling.