Photo-induced Floquet Weyl magnons in noncollinear antiferromagnets
arXiv:1810.04675 · doi:10.1016/j.aop.2019.04.003
Abstract
We study periodically driven insulating noncollinear stacked kagome antiferromagnets with a conventional symmetry-protected three-dimensional (3D) in-plane spin structure, with either positive or negative vector chirality. We show that the symmetry protection of the in-plane spin structure can be broken in the presence of an off-resonant circularly or linearly polarized electric field propagating parallel to the in-plane spin structure (say along the direction). Consequently, topological Floquet Weyl magnon nodes with opposite chirality are photoinduced along the momentum direction. They manifest as the monopoles of the photoinduced Berry curvature. We also show that the system exhibits a photoinduced magnon thermal Hall effect for circularly polarized electric field. Furthermore, we show that the photoinduced chiral spin structure is a canted 3D in-plane spin structure, which was recently observed in the equilibrium noncollinear antiferromagnetic Weyl semimetals MnSn\slash Ge. Our result not only paves the way towards the experimental realization of Weyl magnons and photoinduced thermal Hall effects, but also provides a powerful mechanism for manipulating the intrinsic properties of 3D topological antiferromagnets.
arXiv comment12 pages, 8 figures. Published version
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