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Origin and mechanism analysis of asymmetric current fluctuations in single-molecule junctions

机译：单分子结中不对称电流波动的起源和机制分析

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摘要

The measurements of molecular electronic devices usually suffer from serious noise. Although noise hampers the operation of electric circuits in most cases, current fluctuations in single-molecule junctions are essentially related to their intrinsic quantum effects in the process of electron transport. Noise analysis can reveal and understand these processes from the behavior of current fluctuations. Here, in this study we observe and analyze the faint asymmetric current distribution in single-molecule junctions, in which the asymmetric intensity is highly related to the applied biases. The exploration of high-order moments within bias and temperature dependent measurements, in combination with model Hamiltonian calculations, statistically prove that the asymmetric current distribution originates from the inelastic electron tunneling process. Such results demonstrate a potential noise analysis method based on the fine structures of the current distribution rather than the noise power, which has obvious advantages in the investigation of the inelastic electron tunneling process in single-molecule junctions.
机译：分子电子设备的测量通常遭受严重的噪音。尽管在大多数情况下，噪声阻碍了电路的操作，但是单分子交叉点的电流波动基本上与它们在电子传输过程中的本质量子效应相关。噪声分析可以从电流波动的行为揭示和理解这些过程。这里，在本研究中，我们观察和分析单分子结中的微弱不对称电流分布，其中不对称强度与所施加的偏差高度相关。偏差和温度依赖测量内的高阶矩的探索与模型哈密顿计算，统计上证明非对称电流分布源自无弹性电子隧道工艺。这种结果证明了基于电流分布的细结构而不是噪声功率的潜在噪声分析方法，这在单分子结中的无弹性电子隧道过程中具有明显的优势。

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  • 来源
    《RSC Advances》 |2018年第69期|共6页
  • 作者

    Gu Chunhui; Wang Hao; Sun Hantao; Liao Jianhui; Hou Shimin; Guo Xuefeng;

  • 作者单位

    Peking Univ Coll Chem &

    Mol Engn State Key Lab Struct Chem Unstable &

    Stable Speci Beijing Natl Lab Mol Sci Beijing 100871 Peoples R China;

    Peking Univ Dept Elect Key Lab Phys &

    Chem Nanodevices Beijing 100871 Peoples R China;

    Peking Univ Dept Elect Key Lab Phys &

    Chem Nanodevices Beijing 100871 Peoples R China;

    Peking Univ Dept Elect Key Lab Phys &

    Chem Nanodevices Beijing 100871 Peoples R China;

    Peking Univ Dept Elect Key Lab Phys &

    Chem Nanodevices Beijing 100871 Peoples R China;

    Peking Univ Coll Chem &

    Mol Engn State Key Lab Struct Chem Unstable &

    Stable Speci Beijing Natl Lab Mol Sci Beijing 100871 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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