Investigation of thermalization in giant-spin models by different Lindblad schemes

TL;DR

This paper examines how effectively different Lindblad schemes model thermal relaxation in giant-spin systems, focusing on the impact of various operators representing the thermal bath, with implications for understanding magnetic quantum dynamics.

Contribution

It provides a comparative analysis of Lindblad approaches in modeling relaxation processes in giant-spin models, highlighting the influence of different bath operators.

Findings

Lindblad schemes vary in accuracy depending on the operator used.

Certain operators better capture thermal relaxation dynamics.

Results inform improved modeling of quantum magnetic systems.

Abstract

The theoretical understanding of time-dependence in magnetic quantum systems is of great importance in particular for cases where a unitary time evolution is accompanied by relaxation processes. A key example is given by the dynamics of single-molecule magnets where quantum tunneling of the magnetization competes with thermal relaxation over the anisotropy barrier. In this article we investigate how good a Lindblad approach describes the relaxation in giant spin models and how the result depends on the employed operator that transmits the action of the thermal bath.