Figure 2From: Site-selective substitutional doping with atomic precision on stepped Al (111) surface by single-atom manipulationThe process of extracting Al atom from the step row by the trimer-apex tip. (a) The tip is located upon the manipulated atom. (b) Lower down the tip and the manipulated atom rises. (c) Lift up the tip gradually. (d) Finally, the atom is completely extracted from the step site and adsorbed on the tip.Back to article page