Interacting topological magnons in a checkerboard ferromagnet

TL;DR

This paper investigates how magnon-magnon interactions affect the topological properties of a two-dimensional checkerboard ferromagnet, revealing temperature and magnetic field control of topological phases and a unique double phase transition.

Contribution

It introduces a first-order Green function approach to analyze magnon interactions and demonstrates their role in topological phase transitions in checkerboard ferromagnets.

Findings

Magnon-magnon interactions influence magnon band topology.

The system exhibits two distinct topological phases.

Topological phase transitions can be controlled by temperature and magnetic field.

Abstract

This work is devoted to studying the magnon-magnon interaction effect in a two-dimensional checkerboard ferromagnet with the Dzyaloshinskii-Moriya interaction. By means of the first-order Green function formalism, the influence of magnon-magnon interaction on the magnon band topology is analyzed. In order to verify that the gap-closing phenomenon is a signature for the topological phase transitions of the checkerboard ferromagnet, we display that the Chern numbers of renormalized magnon bands are distinct above and below the critical temperature. Our results show that the checkerboard ferromagnet possesses two topological phases and its topological phase can be controlled either by the temperature or applied magnetic field due to magnon-magnon interactions. Interestingly, we find that the topological phase transition occurs twice with the increase of the temperature, which is different from the result of the honeycomb ferromagnet.