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arXiv · 2410.05556

Four-Wave Mixing at peV Energy Scales

C. Simon·D. M. Silevitch·T. F. Rosenbaum
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Abstract

We measure the non-linear magnetic susceptibility $\chi^{(3)}$ of the disordered quantum Ising magnet, \lihofour, and demonstrate four-wave mixing due to coherent (anti-)Stokes Raman scattering at $\sim$ 100 Hz (p$e$V) energy scales. The temperature dependence of $\chi^{(3)}$ approximately follows a $\frac{1}{T}$ form, with a high-$T$ cutoff that can be linked to dissipation in the coherent spin clusters. $\chi^{(3)}$ 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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C. Simon, D. M. Silevitch, T. F. Rosenbaum. 2024-10-07. Four-Wave Mixing at peV Energy Scales. https://arxiv.org/abs/2410.05556

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