Dynamical phenomena in fast sliding nanotube models

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	Dynamical phenomena in fast sliding nanotube models
	Zhang, XH(张骁骅)
刊名	PHILOSOPHICAL MAGAZINE
	2013-03-01
卷号	93 期号:8 页码:922-948
关键词	nanotubes chirality symmetry breaking nonlinearity molecular dynamics sliding nanofriction
通讯作者	Tosatti, E
英文摘要	The experimentally known fact that coaxial carbon nanotubes can be forced to slide one inside the other stimulated in the past much detailed modelling of the dynamical sliding process. Molecular dynamics simulations of sliding coaxial nanotubes showed the existence of strong frictional peaks when, at large speed, one tube excites the other with a ‘washboard’ frequency that happens to resonate with some intrinsic vibration frequency. At some of these special speeds we discover a striking example of dynamical symmetry breaking taking place at the nanoscale. Even when both nanotubes are perfectly left–right symmetric and nonchiral, precisely in correspondence with the large peaks of sliding friction occurring at a series of critical sliding velocities, a nonzero angular momentum spontaneously appears. A detailed analysis shows that this internal angular momentum is of phonon origin, in particular arising from preferential excitation of a right polarized (or, with equal probability, of a left polarized) outer-tube ‘pseudorotation’ mode, thus spontaneously breaking their exact twofold right–left degeneracy. We present and discuss a detailed analysis of nonlinear continuum equations governing this phenomenon, showing the close similarity of this phenomenon with the well-known rotational instability of a forced string, which takes place under sufficiently strong periodic forcing of the string. We also point out new elements appearing in the present problem which are ‘nano’, in particular the involvement of Umklapp processes and the role of sliding nanofriction.
收录类别	SCI ; EI
语种	英语
公开日期	2014-01-13
内容类型	期刊论文
源URL	[http://ir.sinano.ac.cn/handle/332007/1337]
专题	苏州纳米技术与纳米仿生研究所_先进材料研究部_李清文团队
推荐引用方式 GB/T 7714	Zhang, XH. Dynamical phenomena in fast sliding nanotube models[J]. PHILOSOPHICAL MAGAZINE,2013,93(8):922-948.
APA	Zhang, XH.(2013).Dynamical phenomena in fast sliding nanotube models.PHILOSOPHICAL MAGAZINE,93(8),922-948.
MLA	Zhang, XH."Dynamical phenomena in fast sliding nanotube models".PHILOSOPHICAL MAGAZINE 93.8(2013):922-948.