Electromechanical Response of a SiC Nanotube under Local Torsional Deformation

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• 作者：Jianming Jia ; Shin-Pon Ju ; Daning Shi ; Kuan-Fu Lin
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：December 15, 2011
• 年：2011
• 卷：115
• 期：49
• 页码：24347-24352
• 全文大小：978K
• 年卷期：v.115,no.49(December 15, 2011)
• ISSN：1932-7455

文摘

The electromechanical properties of a SiC nanotube under local torsional deformation have been characterized for the single-walled (7,0) zigzag model using a combined formalism of density functional theory and nonequilibrium Green鈥檚 function. It is shown that, with the increase of torsion angle, the SiC nanotube undergoes, in turn, the structural evolution with the circular section retained and torsional buckling until complete failure. The local deformation has a significant effect on the transport properties of the nanotube, resulting in the torsion-dependent transport spectrum and current鈥搗oltage characteristics. The variation of the current at a given bias with the torsion angle can be attributed to the local-torsion-induced energy shift of edge states in the twisted region of the SiC nanotube.