Relaxation of a classical spin coupled to a strongly correlated electron system

TL;DR

This paper investigates the complex real-time dynamics of a classical spin coupled to strongly correlated electrons, revealing unconventional behavior and a prethermalization scenario driven by electronic correlations and magnetic time scales.

Contribution

It introduces a novel analysis of spin dynamics in strongly correlated systems, highlighting the role of correlation-induced magnetic moments and prethermalization phenomena.

Findings

Unconventional spin dynamics not described by Gilbert damping

Different electronic dissipation channels activate on separate time scales

Prethermalization observed near the divergent magnetic time scale

Abstract

A classical spin which is antiferromagnetically coupled to a system of strongly correlated conduction electrons is shown to exhibit unconventional real-time dynamics which cannot be described by Gilbert damping. Depending on the strength of the local Coulomb interaction, the two main electronic dissipation channels, transport of excitations via correlated hopping and via excitations of correlation-induced magnetic moments, become active on largely different time scales. We demonstrate that this can lead to a prethermalization scenario which so far has been observed in purely electronic systems only and which is governed here by proximity to the divergent magnetic time scale in the infinite-U limit.