Fig. 3
From: Strong negative nonlinear friction from induced two-phonon processes in vibrational systems
Self-sustained vibrations associated with strong negative nonlinear friction. a Amplitude of vibrations of mode 1 as a function of pump detuning Δ. The stable branches are in red; they correspond to self-sustained vibrations and a zero-amplitude state. The light red dots represent the threshold amplitude for exciting self-sustained vibrations. The error bar is smaller than the dot size. Inset: spectrum of the self-sustained vibrations. b The same plot for mode 2. c Depending on the initial amplitude, mode 1 decays to zero (purple) or settle into self-sustained vibrations (orange and dark red). The two dashed lines mark the values of Ast and Ath. d The instantaneous decay rate extracted from (c). The solid lines in all panels are theoretical predictions (Supplementary Notes 2 and 3). Error bars represent ±1 s.e.
