Non-Linear Dynamics of Frustrated Magnets

Magnetic frustration can, in some cases, be strong enough so as to completely suppress long-range magnetic order. In the classical limit, this results in so-called "classical spin liquids". Such spin liquids possess a highly unconventional excitation spectrum, often consisting, within the context of linear response, of a broad and relatively featureless continuum across both energy and momentum. Here, I will discuss how non-linear response, as probed via two-dimensional coherent spectroscopy, can be used to reveal sharp features of classical spin liquids, and compare and contrast these features with those of conventional long-range ordered phases.