Iancu Violeta, Deshpande Aparna, Hla Saw-Wai
Nanoscale and Quantum Phenomena Institute, Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA.
Phys Rev Lett. 2006 Dec 31;97(26):266603. doi: 10.1103/PhysRevLett.97.266603. Epub 2006 Dec 28.
We report the manipulation of a Kondo resonance originating from the spin-electron interactions between a two-dimensional molecular assembly of TBrPP-Co molecules and a Cu(111) surface at 4.6 K. By manipulating nearest-neighbor molecules with a scanning tunneling microscope tip we are able to tune the spin-electron coupling of the center molecule inside a hexagonal molecular assembly in a controlled step-by-step manner. The Kondo temperature increases from 105 to 170 K with decreasing the number of nearest neighbor molecules from six to zero. The scattering of surface electrons by the molecules located at edges of the molecular layer reduces the spin-electron coupling strength for the molecules inside the layer. Investigations of different molecular arrangements indicate that the observed Kondo resonance is independent on the molecular lattice.
我们报道了在4.6K温度下，对源自二维TBrPP-Co分子组装体与Cu(111)表面之间自旋-电子相互作用的近藤共振的操控。通过用扫描隧道显微镜针尖操控最近邻分子，我们能够以可控的逐步方式调节六边形分子组装体内中心分子的自旋-电子耦合。随着最近邻分子数量从六个减少到零，近藤温度从105K升高到170K。位于分子层边缘的分子对表面电子的散射降低了层内分子的自旋-电子耦合强度。对不同分子排列的研究表明，观察到的近藤共振与分子晶格无关。
