Fig. 6
From: Tuning high-Q nonlinear dynamics in a disordered quantum magnet
Evolution of resonant behavior vs. transverse field at T = 0.11 K for a 202 Hz/0.3 Oe pump. a Fano parameter q vs. transverse field showing a continuous evolution including a smooth crossing through zero. Dashed line is a guide to the eye. b Evolution of the phase of the complex susceptibility at f = fpump for the nonlinear (open symbols) and linear (filled symbols) responses. As with the hpump dependence shown in Fig. 5, the zero crossing of q is associated with a vanishing of the dissipation in the linear response with the same functional form, demonstrating universal behavior from two disparate tuning parameters. Blue curves follow from Eqs. 2 and 3 in text as for Fig. 5b. c Real susceptibility χ’ measured directly at f = fpump (open symbols) and determined by extrapolating the fitted Fano resonance to f = fpump (filled symbols), showing a small but apparent distinction in the evolution of the nonlinear and linear responses. d Fano linewidth Γ vs. transverse field. In contrast to the behavior as a function of hpump, increasing Ht does not change the linewidth. All error bars are SDs
