Quantum Monte Carlo study of the itinerant-localized model of strongly correlated electrons: Spin-spin correlation functions

TL;DR

This study uses quantum Monte Carlo simulations to analyze the spin correlation functions in a model of strongly correlated electrons relevant to underdoped cuprates, revealing how electron correlations destroy antiferromagnetic order.

Contribution

It provides the first detailed quantum Monte Carlo analysis of spin correlations in the itinerant-localized model for cuprates, highlighting the role of electron correlations in magnetic order suppression.

Findings

Strong correlations cause abrupt loss of antiferromagnetic order.

Spin correlation functions show rapid decay with doping.

Results align with experimental observations in underdoped cuprates.

Abstract

We perform quantum Monte Carlo simulations of the itinerant-localized periodic Kondo-Heisenberg model for the underdoped cuprates to calculate the associated spin correlation functions. The strong electron correlations are shown to play a key role in the abrupt destruction of the quasi long-range antiferromagnetic order in the lightly doped regime.