# Photoinduced Floquet topological magnons in Kitaev magnets

## TL;DR

This paper demonstrates how off-resonant light can induce and control topological magnons and thermal Hall effects in Kitaev magnets, enabling ultrafast manipulation of their magnetic properties.

## Contribution

It introduces a method to generate and tune Floquet topological magnons and chiral edge modes in Kitaev models using polarized light, revealing new pathways for ultrafast magnetic control.

## Key findings

- Floquet topological magnons can be induced by off-resonant light.
- The magnetic field and topological properties are tunable by light amplitude and polarization.
- Thermal Hall effect is controllable via laser fields.

## Abstract

We study periodically driven pure Kitaev model and ferromagnetic phase of the Kitaev-Heisenberg model on the honeycomb lattice by off-resonant linearly and circularly-polarized lights at zero magnetic field. Using a combination of linear spin wave and Floquet theories, we show that the effective time-independent Hamiltonians in the off-resonant regime map onto the corresponding anisotropic static spin model, plus a tunable photoinduced magnetic field along the $[111]$ direction, which precipitates Floquet topological magnons and chiral magnon edge modes. They are tunable by the light amplitude and polarization. Similarly, we show that the thermal Hall effect induced by the Berry curvature of the Floquet topological magnons can also be tuned by the laser field. Our results pave the way for ultrafast manipulation of topological magnons in irradiated Kitaev magnets, and could play a pivotal role in the investigation of ultrafast magnon spin current generation in Kitaev materials.