标题： 驱动纳米机械模式旋转框架中的非指数弛豫 显示英文标题

标题： Non-Exponential Relaxation in the Rotating Frame of a Driven Nanomechanical Mode

摘要： 我们直接观察了在共振驱动的单模非线性纳米机械谐振器的旋转框架中的环音动力学。 一个接近共振的谐波力在旋转框架中激发固定点附近的非线性振荡。 当次级驱动被移除时，我们测量了同相和正交分量向该固定点的衰减。 我们表明，同相信号的衰减是非指数的，尽管如果关闭两个力，振动幅度会呈指数衰减。 一个极简模型捕捉了这些动力学以及由附加力激发的振动频谱，将它们与旋转框架中动力学的耗散诱导对称性破缺联系起来。 显示英文摘要

摘要： We present direct observation of the ring-down dynamics in the rotating frame of a resonantly driven single-mode nonlinear nanomechanical resonator. An additional close to resonance harmonic force excites nonlinear oscillations about the fixed point in the rotating frame. When the secondary drive is removed, we measure decay of the in-phase and quadrature components toward this fixed point. We show that the decay of the in-phase signal is non-exponential, even though the vibration amplitude decays exponentially if both forces are switched off. A minimalistic model captures these dynamics as well as the spectrum of the vibrations excited by the additional force, relating them to the dissipation-induced symmetry breaking of the dynamics in the rotating frame.