Versatile Approach to the Spin Dynamics in Correlated Electron Systems

TL;DR

This paper introduces a versatile theoretical framework using real-space time-dependent rotational-invariant slave boson methodology to study correlated spin dynamics in itinerant local-moment materials, bridging weak and strong correlation regimes.

Contribution

It presents a novel real-space, non-equilibrium approach capable of handling correlated spin dynamics beyond traditional band theory and Heisenberg models.

Findings

Efficient numerical treatment of non-equilibrium spin phenomena.

Applicable to materials with vanishing charge gaps.

Bridges the gap between weakly and strongly correlated spin models.

Abstract

Time-dependent spin phenomena in condensed matter are most often either described in the weakly correlated limit of metallic Stoner/Slater-like magnetism via band theory or in the strongly correlated limit of Heisenberg-like interacting spins in an insulator. However many experimental studies, e.g. of (de)magnetization processes, focus on itinerant local-moment materials such as transition metals and various of their compounds. We here present a general theoretical framework that is capable of addressing correlated spin dynamics, also in the presence of a vanishing charge gap. A real-space implementation of the time-dependent rotational-invariant slave boson methodology allows to treat non-equilibrium spins numerically fast and efficiently beyond linear response as well as beyond the band-theoretical or Heisenberg limit.