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arXiv 1107.3434cond-mat.mes-hall
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电子在分子导线中的热输运:热涨落的功率谱

Electronic Heat Transport Across a Molecular Wire: Power Spectrum of Heat Fluctuations

Fei Zhan, Sergey Denisov, Peter Hanggi

摘要:

在这项研究中,我们分析了一个电子只有通过分子导线的热流的波动。导线由单个能级组成,该能级连接到保持在不同温度下的两个引线。利用格林函数方法,我们推导出有限频率的功率谱密度(PSD)的新兴的热流波动。该结果假定了与伴随的电流噪声的功率谱密度完全不同的形式。在零频率的限制下,复杂的表达式大大简化,产生热噪声强度。热噪声强度仍然取决于频率在零温度限制,假设不同的渐近行为在低和高频率制度。这些发现表明,分子结之间的热传输可以表现出丰富的结构,超出了线性响应极限中出现的常见行为。

英文摘要:

With this study we analyze the fluctuations of an electronic only heat current across a molecular wire. The wire is composed of a single energy level which connects to two leads which are held at different temperatures. By use of the Green function method we derive the finite frequency power spectral density (PSD) of the emerging heat current fluctuations. This result assumes a form quite distinct from the power spectral density of the accompanying electric current noise. The complex expression simplifies considerably in the limit of zero frequency, yielding the heat noise intensity. The heat noise intensity still depends on the frequency in the zero-temperature limit, assuming different asymptotic behaviors in the low- and high-frequency regimes. These findings evidence that heat transport across molecular junctions can exhibit a rich structure beyond the common behavior which emerges in the linear response limit.

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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