Fig. 2
From: Tuning high-Q nonlinear dynamics in a disordered quantum magnet
Linear absorption spectra of LiHo0.045Y0.955F4 as a function of temperature. a Measured absorption in the presence of a 0.3 Oe pump field at fpump = 202 Hz and zero transverse field; probe field has 20 mOe amplitude. Curves are fits to Fano resonance forms, Eq. (2) in the text. The points at f = fpump (open symbols) are omitted from the fits (see text for details). b Absorption normalized with respect to the response at Δf = 30 mHz as a function of frequency and temperature. Color and z position both indicate normalized absorption. c Linewidth of the resonance, as determined from fitting to the Fano model, vs. temperature T. Line is a fit to an intrinsic linewidth of 1.7 mHz plus exponential thermal broadening with Δ = 740 mK . d Fano parameter q vs. temperature, showing the suppression of coupling to the bath at the lowest T. Lines are guides to the eye. All error bars are SDs
