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首页> 外文会议>Carbon nanotubes, graphene, and associated devices IV >Effects of the central armchair nanotube size on the conductance of carbon nanotube quantum dots
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Effects of the central armchair nanotube size on the conductance of carbon nanotube quantum dots

机译：扶手椅中央碳纳米管尺寸对碳纳米管量子点电导的影响

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摘要

Recently, one of the most significant topics in electronic devices is miniaturization. It has been a growing interest in some mesoscopic systems such as quantum dots. The size of these quantum dots approaches to the atomic scale, which contributes to interesting new behaviors. Understanding their properties is an important problem in the fields of nano electronics. Here we study the transport properties of the single wall carbon nanotubes quantum dots. Considering Carbon nanotubem (2n, 0)/ l(n, n)/m(2n, 0) quantum dot, we have investigated the effects of the central cell size on the conductance of the system. By increasing the length of armchair carbon nanotube in metal-metal-metal quantum dot m(12,0)/l (6,6)/m(12,0) , we have observed reduction in the conductance. In semiconductor- metal- semiconductor quantum dotsm(8,0)/l(4,4)/m(8,0), increasing the length of armchair part causes the scattering rate raising. For more than special length, due to the destructive and constructive interference of the wave functions, the conductance gap oscillates near the Fermi energy. Therefore, by controlling on cell size characteristics, it is possible to manipulate some efficient devices in nano-electronics.
机译：近来，电子设备中最重要的主题之一是小型化。对于某些介观系统，例如量子点，人们越来越感兴趣。这些量子点的大小接近原子尺度，这有助于产生有趣的新行为。在纳米电子领域，了解它们的特性是一个重要的问题。在这里，我们研究了单壁碳纳米管量子点的传输特性。考虑到碳纳米管（2n，0）/ l（n，n）/ m（2n，0）量子点，我们研究了中心孔尺寸对系统电导的影响。通过增加金属-金属-金属量子点m（12,0）/ l（6,6）/ m（12,0）中的扶手椅状碳纳米管的长度，我们观察到电导率降低。在半导体-金属-半导体量子点m（8,0）/ l（4,4）/ m（8,0）中，增加扶手椅部分的长度会导致散射率升高。对于特殊长度，由于波函数的破坏性和建设性干扰，电导间隙在费米能量附近振荡。因此，通过控制单元尺寸特征，可以操纵纳米电子学中的一些有效器件。

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