Quantized thermal transport in single-atom junctions
Quantized thermal transport in single-atom junctions
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DOI：
10.1126/science.aam6622
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发表时间：
2017-03-17
期刊：
影响因子：
56.9
通讯作者：
Reddy, Pramod
中科院分区：
文献类型：
--
作者：
Cui, Longji;Jeong, Wonho;Reddy, Pramod
在单个的原子结和链中的热输运是非常重要的，因为预期在它们中出现的独特的量子效应。通过使用新型的，定制的，皮瓦分辨率的量热扫描探针，我们测量了金和铂金属线的热导率下降到单原子结。我们的工作揭示了金单原子结的热导在室温下是量子化的，并且表明即使在单原子接触中，与热导和电导相关的Wiedemann-Franz定律也是满足的。此外，我们定量解释我们的实验结果量子热输运的Landauer框架内。这里报道的实验技术将使热输运研究的原子和分子链，这将是关键的调查许多基本问题，迄今为止仍然实验无法访问。
Thermal transport in individual atomic junctions and chains is of great fundamental interest because of the distinctive quantum effects expected to arise in them. By using novel, custom-fabricated, picowatt-resolution calorimetric scanning probes, we measured the thermal conductance of gold and platinum metallic wires down to single-atom junctions. Our work reveals that the thermal conductance of gold single-atom junctions is quantized at room temperature and shows that the Wiedemann-Franz law relating thermal and electrical conductance is satisfied even in single-atom contacts. Furthermore, we quantitatively explain our experimental results within the Landauer framework for quantum thermal transport. The experimental techniques reported here will enable thermal transport studies in atomic and molecular chains, which will be key to investigating numerous fundamental issues that thus far have remained experimentally inaccessible.