Four-Wave Mixing at peV Energy Scales
Abstract
We measure the non-linear magnetic susceptibility (3) of the disordered quantum Ising magnet, , and demonstrate four-wave mixing due to coherent (anti-)Stokes Raman scattering at 100 Hz (peV) energy scales. The temperature dependence of (3) approximately follows a 1T form, with a high-T cutoff that can be linked to dissipation in the coherent spin clusters. (3) also decreases monotonically with a transverse field, approaching a constant offset above a few kOe, suggesting the presence of both coherent, and spontaneous Raman scattering.
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