Photoinduced Topological Phase Transitions in a Kitaev kagome magnet

Based on the magnetic Floquet-Bloch theory, we investigate topological natures of Floquet magnons in a laser-irradiated kagome magnet exhibiting Heisenberg, Kitaev and Dzyaloshinskii Moriya interactions in the presence of an external magnetic field applied along directions of [111]. In a strong magnetic field perpendicular to the lattice plane [111] direction, the system is in the fully polarized paramagnetic phase and the magnon band carries an asymmetric Chern number throughout the region of the phase diagram. Our results show that periodically driven intrinsic topological magnetic materials can be manipulated into different topological phases with different thermal conductivities and Berry curvature signatures by adjusting the light intensity throughout the phase diagram region.