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arXiv 0712.0753cond-mat.mes-hall
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纳机电系统中的表面耗散:用标准隧穿模型和金属电极效应的统一描述

Surface dissipation in nanoelectromechanical systems: Unified description with the standard tunneling model and effects of metallic electrodes

C. Seoanez, F. Guinea, A. H. Castro Neto

摘要:

通过修改和扩展最近的想法[C。Seoanez等人,欧罗巴Lett. 78,60002(2007)],一个理论框架来描述耗散过程中的振动的微和纳米机电设备的表面,被认为是在低温下的摩擦的主要来源,提出。给出了双固支梁和悬臂梁的弯曲和扭转模态的品质因数以及频移,表明了这些系统的尺寸、温度和其它有关参数的比例关系。与实验观察没有得到完全一致,导致讨论的局限性和可能的修改方案,以达到定量拟合实验。对于覆盖有金属电极的纳机电系统,由于流动的电子和器件和衬底中的静电荷之间的静电相互作用的摩擦也进行了研究。

英文摘要:

By modifying and extending recent ideas [C. Seoanez et al., Europhys. Lett. 78, 60002 (2007)], a theoretical framework to describe dissipation processes in the surfaces of vibrating micro- and nanoelectromechanical devices, thought to be the main source of friction at low temperatures, is presented. Quality factors as well as frequency shifts of flexural and torsional modes in doubly clamped beams and cantilevers are given, showing the scaling with dimensions, temperature, and other relevant parameters of these systems. Full agreement with experimental observations is not obtained, leading to a discussion of limitations and possible modifications of the scheme to reach a quantitative fitting to experiments. For nanoelectromechanical systems covered with metallic electrodes, the friction due to electrostatic interaction between the flowing electrons and static charges in the device and substrate is also studied.

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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