Temirov R, Lassise A, Anders F B, Tautz F S
Jacobs University Bremen, School of Engineering and Science, PO Box 750561, D-28725 Bremen, Germany. Institut für Bio- und Nanosysteme 3, JARA, Forschungszentrum Jülich, 52425 Jülich, Germany.
Nanotechnology. 2008 Feb 13;19(6):065401. doi: 10.1088/0957-4484/19/6/065401. Epub 2008 Jan 23.
Conductance measurements of a molecular wire, contacted between an epitaxial molecule-metal bond and the tip of a scanning tunnelling microscope, are reported. Controlled retraction of the tip gradually de-hybridizes the molecule from the metal substrate. This tunes the wire into the Kondo regime in which the renormalized molecular transport orbital serves as a spin impurity at half-filling and the Kondo resonance opens up an additional transport channel. Numerical renormalization group simulations suggest this type of behaviour to be generic for a common class of metal-molecule bonds. The results demonstrate a new approach to single-molecule experiments with atomic-scale contact control and prepare the way for the ab initio simulation of many-body transport through single-molecule junctions.
报道了在外延分子 - 金属键与扫描隧道显微镜尖端之间接触的分子线的电导测量。尖端的受控缩回逐渐使分子与金属衬底解杂化。这将分子线调谐到近藤区，在该区中，重整化的分子输运轨道在半填充时作为自旋杂质，并且近藤共振打开了一个额外的输运通道。数值重整化群模拟表明，这种行为对于一类常见的金属 - 分子键是普遍存在的。这些结果展示了一种具有原子尺度接触控制的单分子实验新方法，并为通过单分子结进行多体输运的从头算模拟铺平了道路。
