Thermally Driven Topology in Frustrated Systems

TL;DR

This paper investigates thermally induced topological phenomena in a frustrated 2D spin system with Dzyaloshinskii-Moriya interaction, revealing temperature-driven topological charge behavior and proposing a real material system for experimental realization.

Contribution

It uncovers thermally driven topology in frustrated systems and links it to system parameters, proposing Mn-Bi monolayer as a candidate for experimental observation.

Findings

Thermally driven topology dominates at low magnetic fields.

Topological charge scales quadratically with DM interaction.

Real Mn-Bi monolayer system proposed for experimental studies.

Abstract

Non-trivial topology in a two-dimensional frustrated spin system with the Dzyaloshinskii-Moriya (DM) interaction was investigated by Monto Carlo simulations. At finite temperatures, thermally driven topology was discovered and was found to be dominant at low magnetic field. This topological charge has a quadratic relation with the DM interaction and linear realtions with the external magnetic field or the uniaxial magnetic anisotropy. We also proposed a real frustrated system, the Mn-Bi mono-layer film with exceedingly large DM interaction, to enable thermally driven topology. Other topological non-trivial phases in high magnetic field region were also discussed in this real system.