Optical manipulation of magnetism in spin-charge coupled correlated electron system

TL;DR

This paper investigates how intense light irradiation can strengthen antiferromagnetic insulating states in a correlated electron system, revealing a novel method for optical control of magnetism distinct from traditional carrier doping effects.

Contribution

It demonstrates a new principle for optically manipulating magnetism by showing that intense light can reinforce antiferromagnetic insulating states instead of inducing ferromagnetic metallic behavior.

Findings

Intense light irradiation strengthens AFM insulating states.

Weak light or doping typically induces ferromagnetic metallic states.

A new optical control mechanism for magnetism is proposed.

Abstract

Photoirradiation effects in correlated electrons coupled with localized spins are studied based on the extended double-exchange model. In particular, we examine melting of an antiferromagnetic (AFM) charge order insulating state by varying the light intensity. When intense light is irradiated, the AFM insulating characteristics are strengthened, rather than change into the ferromagnetic metallic characteristic, which are expected from the conventional double exchange interaction when carriers are introduced by weak light irradiation or chemical doping. This provides a new principle for optically manipulating magnetism.