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arXiv 1609.08714cond-mat.mes-hallquant-ph
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纳米机械系统中的非线性阻尼和失相

Nonlinear damping and dephasing in nanomechanical systems

J. Atalaya, T. W. Kenny, M. L. Roukes, M. I. Dykman

摘要:

我们提出了一个微观理论的非线性阻尼和失相的低频本征模式在纳米和微机械系统。这两种效应的机制是热激发的振动模式的散射所考虑的本征模式。对于非线性阻尼,散射伴随着$2\hbarω_0$的能量转移,对于退相,散射是准弹性的。我们发展了一种形式主义,它允许研究空间均匀系统和具有强非均匀性的系统,这是光滑的热模式的典型波长,但不是他们的平均自由程。我们确定的非线性类似物的朗道-鲁默,热弹性,和Akhiezer机制,并找到依赖的弛豫参数的温度和系统的几何形状。

英文摘要:

We present a microscopic theory of nonlinear damping and dephasing of low-frequency eigenmodes in nano- and micro-mechanical systems. The mechanism of the both effects is scattering of thermally excited vibrational modes off the considered eigenmode. The scattering is accompanied by energy transfer of $2\hbarω_0$ for nonlinear damping and is quasieleastic for dephasing. We develop a formalism that allows studying both spatially uniform systems and systems with a strong nonuniformity, which is smooth on the typical wavelength of thermal modes but not their mean free path. The formalism accounts for the decay of thermal modes, which plays a major role in the nonlinear damping and dephasing. We identify the nonlinear analogs of the Landau-Rumer, thermoelastic, and Akhiezer mechanisms and find the dependence of the relaxation parameters on the temperature and the geometry of a system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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