Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 38: Adsorption V

O 38.3: Vortrag

Donnerstag, 30. März 2006, 15:30–15:45, TRE Phys

STM-manipulation of HB-HPB molecules: transport of adatoms and rotation along the edge of a molecular island — •Francesca Moresco, Leo Gross, Franco Chiaravalloti, and Karl-Heinz Rieder — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin

A specially designed six-legs molecule called HB-HPB (hexa-tert-butyl-hexaphenylbenzene), is manipulated on the Cu(111) surface by Scanning Tunnelling Microscopy (STM) at low temperature. The molecule is able to aggregate and move Cu adatoms when moved with a STM tip. A single molecule accommodates up to six copper adatoms forming a 2D cluster. The molecule-atoms complex is then further STM manipulated on the surface to bring the Cu freight to a chosen position on the surface and the atoms alone can be released [2]. Moreover, the molecules form well-ordered monolayer structures by self-organisation on Cu(111) [3]. The manipulation of the molecules along the edge of such molecular ordered islands results in the movement between stable positions within the molecular monolayer structure. By marking one of the six molecular legs by substituting a phenyl side ring by a pyrimidine ring, we demonstrate that the molecule rotates along the edge of the monolayer in 60^∘ steps.

[1] L. Gross, K.-H. Rieder, F. Moresco, S. Stojkovic, A. Gourdon, C. Joachim, Nature Materials, in press

[2] L. Gross, F. Moresco, P. Ruffieux, A. Gourdon, C. Joachim, K.-H. Rieder, Phys. Rev. B 71, 165428 (2005)