Belardinelli P, Yang W, Bachtold A, Dykman M I, Alijani F
Department of Construction, Civil Engineering and Architecture, Polytechnic University of Marche, 60131 Ancona, Italy.
ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels, Barcelona, Spain.
Nano Lett. 2025 May 28;25(21):8443-8449. doi: 10.1021/acs.nanolett.4c06618. Epub 2025 Apr 29.
We demonstrate that a quiet state and large-amplitude self-sustained oscillations can coexist in a carbon nanotube subject to time-independent drive. A feature of the bistability is that it would be hysteresis free in the absence of noise, and the oscillatory state would not be seen. It is revealed by random switching between the stable states, which we observe in the time domain. We attribute the switching to fluctuations in the system and show that it displays Poisson statistics. We propose a minimalistic model that relates the emergence of the bistability to a nonmonotonic variation of nonlinear friction with the vibration amplitude. This new type of dynamical regime and the means to reveal it are generic and are of interest for various mesoscopic vibrational systems.
我们证明，在受到与时间无关的驱动的碳纳米管中，静止状态和大振幅自持振荡可以共存。双稳态的一个特点是，在没有噪声的情况下它将没有滞后现象，并且不会出现振荡状态。我们在时域中观察到的稳定状态之间的随机切换揭示了这一点。我们将这种切换归因于系统中的涨落，并表明它呈现泊松统计。我们提出了一个简约模型，将双稳态的出现与非线性摩擦随振动幅度的非单调变化联系起来。这种新型的动力学机制及其揭示方法具有普遍性，对各种介观振动系统都具有重要意义。
