Controlled damaging and repair of self-organized nanostructures by atom manipulation at room temperature

The possibility of controlled local demolition and repair of the recently discovered self-organized Pt nanowires on Ge( 001) surfaces has been explored. These nanowires are composed of Pt dimers, which are found to be rather weakly bound to the underlying substrate. Using this property, we demonstrate the possibility of carrying the constituting dimers of the Pt nanowires from point to point with atomic precision at room temperature. Pt dimers can be picked- up in two configurations: ( i) a horizontal configuration at the tip apex, resulting in double tip images and ( ii) a configuration where the Pt dimer is attached to the side of the tip apex, resulting in well- defined atomically resolved images.