Hybridized magnonic materials for THz frequency applications

We present recent theoretical developments in magnon-based hybrid systems, focusing on magnonic modes of antiferromagnetic (AFM) materials. The capability of magnons to hybridize and strongly couple with diverse excitations offers a promising avenue for coherent control. This, in turn, paves the way for manipulating the hybridized states and exploiting emergent properties that hold significant potential for applications in devices, circuits, and information processing. In particular, the THz frequency of excitations such as magnons in AFMs, plasmons, phonons in 2D AFMs, and polaritons in topological insulators makes magnon-based hybrid systems particularly appealing for devices with high operating speeds. In this context, we explore several directions to advance magnon hybrid systems, including strong coupling between a surface plasmon and magnon polariton in a TI/AFM bilayer^[1,2] and the giant spin Nernst effect induced by magnon phonon coupling in a 2D AFM^[3].