Spin high-harmonic generation through laser-driven phonons

In the study of open quantum systems, steady states and high-harmonic generation (HHG) far from equilibrium have become foundational aspects of ultrafast science. While most solid-state research has focused on charge HHG, there has been limited exploration of spin degrees of freedom. In this talk, we will theoretically discuss spin HHG in the steady state induced by terahertz laser-driven spin-phonon coupling in two different dissipative spin chains. Instead of using time-dependent magnetic fields to directly drive the spins, we use a magnetophononic mechanism, where the laser first drives the lattice, which in turn excites the spins. We will discuss the impact of different model parameters on optimizing HHG. Notably, we find that driving the system at frequencies well below the spin band produces the highest harmonic orders.