Commensurate Antiferromagnetic Fluctuations with Small Electron Doping

TL;DR

This study explores antiferromagnetic fluctuations in a square lattice with small electron doping, revealing their persistence under certain conditions and the absence of ferromagnetic fluctuations, influenced by hopping terms and Hubbard interaction.

Contribution

It provides a detailed analysis of antiferromagnetic fluctuations across different doping levels and interaction strengths, including the effects of exchange coupling and Van Hove singularities.

Findings

Antiferromagnetic fluctuations occur over a finite filling range.

Commensurate fluctuations dominate beyond a specific doping level.

Ferromagnetic fluctuations are not observed despite exchange field induction.

Abstract

We investigate the presence of antiferromagnetic fluctuations in the longitudinal and transversal spin susceptibilities of a square lattice. The inclusion of both first and second neighbour hopping terms, along with exchange coupling, induces anti-ferromagnetic fluctuations over a finite range of fillings in both longitudinal and transversal static spin susceptibilities. In the absence of on-site Hubbard interaction, we observe incommensurate antiferromagnetic fluctuations between the two Van Hove fillings. Beyond the second Van Hove singularity at $ n=1.03 $, commensurate antiferromagnetic fluctuations dominate in both longitudinal and transversal spin susceptibilities. When incorporating a finite Hubbard interaction strength, $ U $, we find that the commensurate anti-ferromagnetic fluctuations are preserved in both longitudinal and transversal dressed spin susceptibilities. However anti-ferromagnetic fluctuations vanish beyond a critical value of the Hubbard coupling strength, $ U_{c} $. Despite the exchange field can be induced by a ferromagnetic substrate, we do not observe any ferromagnetic fluctuations in the system.