Photoinduced Floquet topological magnons in a ferromagnetic checkerboard lattice

TL;DR

This paper theoretically explores how laser irradiation can induce and control topological phases in magnon insulators on a checkerboard lattice, revealing tunable edge states and thermal Hall effects.

Contribution

It introduces a model for laser-driven Floquet topological magnons on a checkerboard lattice, demonstrating phase transitions and tunable topological properties.

Findings

Laser intensity controls topological phase transitions.

Existence of both Tamm-like and protected edge states.

Floquet thermal Hall conductivity sign is tunable.

Abstract

This theoretical work is devoted to investigating laser-irradiated Floquet topological magnon insulators on a two-dimensional checkerboard ferromagnet and corresponding topological phase transitions. It is shown that the checkerboard Floquet topological magnon insulator is able to be transformed from a topological magnon insulator into another one possessing various Berry curvatures and Chern numbers by changing the light intensity. Especially, we also show that both Tamm-like and topologically protected Floquet magnon edge states can exist when a nontrivial gap opens. In addition, our results display that the sign of the Floquet thermal Hall conductivity is also tunable via varying the light intensity of the laser field.