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arXiv 1408.4450cond-mat.mes-hall
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量子干涉对CNT/aGNR/CNT结噪声功率的影响

Quantum interference effects on the noise power in the CNT/aGNR/CNT junction

A. Ahmadi Fouladi, Javad Vahedi

摘要:

基于紧束缚模型和Landauer-Büttiker形式的广义格林函数方法,数值研究了量子干涉(QI)对夹在无限长单壁碳纳米管(SWCNT)之间的扶手椅型石墨烯纳米管(aGNR)的CNT/aGNR/CNT系统噪声功率和Fano因子的影响.在这项工作中,改变aGNR到CNT电极的接触位置和施加磁场作为QI的两个来源被认为是。我们已经发现了不同的Fano共振和反共振峰的存在下的QI源的电流-电压特性和噪声功率的传输概率显示出深刻的影响。我们的研究结果还表明,散粒噪声特性,无论是在泊松极限($F=1$)或亚泊松极限($F<1$),以及Fano因子的最大值强烈依赖于aGNR到CNT电极的接触位置和磁场强度。这些结果可为设计未来的纳米电子器件提供参考。

英文摘要:

Based on tight-binding model and a generalized Green's function method in Landauer-Büttiker formalism, the effects of quantum interference (QI) on the noise power and Fano factor of an armchair graphene nanoribbon (aGNR) sandwiched between infinite single wall carbon nanotube (SWCNT) as a CNT/aGNR/CNT system are numerically investigated. In this work, changing the aGNR to CNT electrodes contact positions and applying the magnetic field as two sources of QI are considered. We have found different Fano-resonance and anti-resonance peaks on the transmission probability in the presence of QI sources that show profound effects on the current-voltage characteristics and noise power. Our results also show that the shot noise characteristic, either in the Poisson limit ($F=1$) or sub-Poisson limit ($F<1$), and also maximum value of the Fano factor strongly depend on the aGNR to CNT electrodes contact positions and the magnetic field strength. These results can be useful for designing the future nano-electronic devices.

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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