Passing Current through Touching Molecules
Passing Current through Touching Molecules
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DOI：
10.1103/physrevlett.103.206803
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发表时间：
2009-11-13
影响因子：
8.6
通讯作者：
Berndt, Richard
中科院分区：
文献类型：
--
作者：
Schull, Guillaume;Frederiksen, Thomas;Berndt, Richard
探讨了从单个C-60分子到另一个分子的电荷流动。用低温扫描隧道显微镜表征了这两种分子在接触电极上的构象和电子态。虽然单个分子在两个铜电极之间的接触电导可以根据电极几何形状的不同而变化高达3倍，但C-60-C-60接触的电导始终较低2个数量级。第一性原理输运计算再现了实验结果，允许确定实际的C-60-C-60距离，并确定了分子间连接在双分子链和三分子链中的重要作用。
The charge flow from a single C-60 molecule to another one has been probed. The conformation and electronic states of both molecules on the contacting electrodes have been characterized using a cryogenic scanning tunneling microscope. While the contact conductance of a single molecule between two Cu electrodes can vary up to a factor of 3 depending on electrode geometry, the conductance of the C-60-C-60 contact is consistently lower by 2 orders of magnitude. First-principles transport calculations reproduce the experimental results, allow a determination of the actual C-60-C-60 distances, and identify the essential role of the intermolecular link in bi- and trimolecular chains.