Atom-manipulation and self-assembly on metal surfaces

Prof. A. Kara

Department of Physics, University of Central Florida, Orlando, Fl32816

Mardi 27/05/2008, 11:00

SPEC Bât 466 p.111 (1er ét.), CEA-Saclay

In a first part of my talk, I will show how we simulate atomic manipulation on metal surfaces using STM/AFM tips. When a STM/AFM tip approaches to a metal surface, it perturbs locally the energy landscape. As a consequence, the energetics and dynamics of adsorbed species are altered. I will present results on how a tip induces changes during lateral and vertical manipulation of atoms on flat, stepped and kinked surfaces. I will also present our recent results how to “pluck” an atom from a mound; as well as preliminary results on mechanisms involved in 2D islands manipulation. In a second part of my paper, I will present results on a recent study of the atomic and electronic structure of Si nanowires on Ag(110) and pentacene on Cu and Ag (110). Silicon forms very long (>100nm) nanowires on Ag(110), with a definite width of about 4 times the lattice constant of Ag. Using density functional theory, we have studied several configurations and compared our results with available experimental data. I will show detailed results for 2 configurations containing 30 and 36 Si atoms per unit cell respectively. Finally, I will present my preliminary results on the adsorption of a pentacene film on Cu and Ag(110) where the adsorption type (chemisorption/physisorption) is ill defined. I will show how the molecule structure is altered upon adsorption and what electronic changes it induces.

A_Kara_27Mai2008.pdf (211 Ko)

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