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arXiv 0706.2658cond-mat.mes-hall
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多壁碳纳米管中的局域和非局域散粒噪声

Local and Non-local Shot Noise in Multiwalled Carbon Nanotubes

T. Tsuneta, P. Virtanen, F. Wu, T. Wang, T. T. Heikkilä, P. J. Hakonen

摘要:

我们研究了4.2 K时多终端扩散多壁碳纳米管(MWNTs)中的散粒噪声,频率f = 600 - 850 MHz。定量比较我们的数据半经典理论,基于非平衡分布函数,表明噪声的主要部分是由非平衡态所施加的接触。我们的数据表现出非本地的散粒噪声弱传输接触,而低阻抗接触几乎完全消除了这种噪声。我们得到F_{tube} < 0.03的内在Fano因子的MWNTs。

英文摘要:

We have investigated shot noise in multiterminal, diffusive multiwalled carbon nanotubes (MWNTs) at 4.2 K over the frequency f = 600 - 850 MHz. Quantitative comparison of our data to semiclassical theory, based on non-equilibrium distribution functions, indicates that a major part of the noise is caused by a non-equilibrium state imposed by the contacts. Our data exhibits non-local shot noise across weakly transmitting contacts while a low-impedance contact eliminates such noise almost fully. We obtain F_{tube}< 0.03 for the intrinsic Fano factor of our MWNTs.

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