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arXiv 1201.5485cond-mat.mes-hall
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纳米机电系统中接近连续机械不稳定性的大电流噪声

Large current noise in nanoelectromechanical systems close to continuous mechanical instabilities

Jochen Brüggemann, Guillaume Weick, Fabio Pistolesi, Felix von Oppen

摘要:

我们调查的纳米机电系统的电流噪声接近连续的机械不稳定性。在后者附近,纳米机械系统的振动频率消失,使系统对电荷波动非常敏感,因此导致非常大的(超泊松)电流噪声。具体来说,我们认为一个悬浮的单电子晶体管接近欧拉屈曲不稳定性。我们发现,这样的系统表现出指数增强的电流噪声时,接近欧拉不稳定性,我们解释电报噪声。

英文摘要:

We investigate the current noise of nanoelectromechanical systems close to a continuous mechanical instability. In the vicinity of the latter, the vibrational frequency of the nanomechanical system vanishes, rendering the system very sensitive to charge fluctuations and, hence, resulting in very large (super-Poissonian) current noise. Specifically, we consider a suspended single-electron transistor close to the Euler buckling instability. We show that such a system exhibits an exponential enhancement of the current noise when approaching the Euler instability which we explain in terms of telegraph noise.

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