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In-Situ Video-STM Studies of the Quasi-Collective Motion of Nanoscale Metal Strings in Au(100) Electrode Surfaces

Mass transport on metal surfaces is of central importance in homoand heteroepitaxial growth, structural phase transitions, and surface restructuring processes. On the atomic scale it is usually described by diffusion of individual metal adatoms on atomically flat terraces and along steps, as well as the interaction of these adatoms with each other and with surface defects [1,2]. Here we report observations on Au(100) electrode surfaces in acidic solution during the potential-induced (1×1) → “hex” surface phase transition that reveal quasi-collective lateral motion of five atom wide, hexagonally ordered strings of Au atoms embedded in the square lattice of the Au(100)-(1×1) surface.