Figure 4From: Site-selective substitutional doping with atomic precision on stepped Al (111) surface by single-atom manipulationThe process of positioning Ag dopant to the step site by Ag single-apex tip. (a) The tip is located upon the site. (b) As the tip approaches the surface, the dopant atom relaxes toward the up terrace. (c) Move the tip laterally in the X direction. (d) In the end, the dopant atom is released successfully from the tip and adsorbed at the step site.Back to article page