Mechanoelectric sensitivity reveals destructive quantum interference in single-molecule junctions

IF 14.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2024-11-21 DOI:10.1038/s41467-024-53825-x

Sebastiaan van der Poel, Juan Hurtado-Gallego, Matthias Blaschke, Rubén López-Nebreda, Almudena Gallego, Marcel Mayor, Fabian Pauly, Herre S. J. van der Zant, Nicolás Agraït

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Abstract

Quantum interference plays an important role in charge transport through single-molecule junctions, even at room temperature. Of special interest is the measurement of the destructive quantum interference dip itself. Such measurements are especially demanding when performed in a continuous mode of operation. Here, we use mechanical modulation experiments at ambient conditions to reconstruct the destructive quantum interference dip of conductance versus displacement. Simultaneous measurements of the Seebeck coefficient show a sinusoidal response across the dip without sign change. Calculations that include electrode distance and energy alignment variations explain both observations quantitatively, emphasizing the crucial role of thermal fluctuations for measurements under ambient conditions. Our results open the way for establishing a closer link between break-junction experiments and theory in explaining single-molecule transport phenomena, especially when describing sharp features in the transmission.

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机械电灵敏度揭示单分子结中的破坏性量子干扰

量子干涉在单分子结的电荷传输中发挥着重要作用，即使在室温下也是如此。特别令人感兴趣的是对破坏性量子干涉漂移本身的测量。在连续工作模式下，这种测量要求特别高。在这里，我们利用环境条件下的机械调制实验来重建电导与位移的破坏性量子干涉倾角。塞贝克系数的同步测量结果显示，整个倾角呈正弦响应，没有符号变化。包括电极距离和能量排列变化在内的计算从数量上解释了这两种观察结果，强调了热波动对环境条件下测量的关键作用。我们的研究结果为在解释单分子传输现象时，尤其是在描述传输中的尖锐特征时，在断裂交界实验和理论之间建立更紧密的联系开辟了道路。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.