Department of Physics, The Hong Kong University of Science and Technology , Hong Kong, China.
Department of Physics, South University of Science and Technology of China , Shenzhen 518055, China.
ACS Nano. 2015 Dec 22;9(12):12521-8. doi: 10.1021/acsnano.5b06120. Epub 2015 Nov 18.
We apply supramolecular assembly to control the adsorption configuration of Co-porphyrin molecules on Au(111) and Cu(111) surfaces. By means of cryogenic scanning tunneling microscopy, we reveal that the Kondo effect associated with the Co center is absent or present in different supramolecular systems. We perform first-principles calculations to obtain spin-polarized electronic structures and compute the Kondo temperatures using the Anderson impurity model. The switching behavior is traced to varied molecular adsorption heights in different supramolecular structures. These findings unravel that a competition between intermolecular interactions and molecule-substrate interactions subtly regulates the molecular Kondo effect in supramolecular systems.
我们应用超分子组装来控制钴卟啉分子在 Au(111) 和 Cu(111) 表面上的吸附构型。通过低温扫描隧道显微镜，我们揭示了与 Co 中心相关的近藤效应在不同的超分子体系中是否存在。我们进行了第一性原理计算，以获得自旋极化的电子结构，并使用安德森杂质模型计算近藤温度。开关行为可以追溯到不同超分子结构中分子的不同吸附高度。这些发现表明，分子间相互作用和分子-衬底相互作用之间的竞争微妙地调节了超分子体系中的分子近藤效应。
