Studying the thermoelectric effect in DNA is important for unravelling charge transport mechanisms and for developing relevant applications of DNA molecules. Here we report a study of the thermoelectric effect in single DNA molecules. By varying the molecular length and sequence, we tune the charge transport in DNA to either a hopping- or tunnelling-dominated regimes. The thermoelectric effect is small and insensitive to the molecular length in the hopping regime. In contrast, the thermoelectric effect is large and sensitive to the length in the tunnelling regime. These findings indicate that one may control the thermoelectric effect in DNA by varying its sequence and length. We describe the experimental results in terms of hopping and tunnelling charge transport models.

中文翻译：

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热电效应及其对单个DNA分子中分子长度和序列的依赖性。

研究DNA中的热电效应对于揭示电荷传输机制和开发DNA分子的相关应用很重要。在这里，我们报告了单个DNA分子中热电效应的研究。通过改变分子的长度和序列，我们将DNA中的电荷迁移调整为以跳跃或隧穿为主的机制。热电效应很小，并且对跳跃过程中的分子长度不敏感。相反，热电效应很大，并且对隧穿区域的长度敏感。这些发现表明，可以通过改变DNA的序列和长度来控制DNA中的热电效应。我们根据跳变和隧穿电荷传输模型来描述实验结果。