title: Anomalous scaling in heteroepitaxial island dynamics on Ag(100).
abstract: Diffusion and decay of alloyed Cu/Ag islands are investigated in the size range from 1 to 40  nm2 on Ag(100) at room temperature with fast-scanning tunneling microscopy and density functional theory. While islands at sizes above 7  nm2 show the diffusion and decay behavior expected for dynamics based on single atom hopping, islands smaller than 4  nm2 diffuse faster and decay slower than predicted by standard theory. This anomalous behavior at unexpected large island sizes is related to a size dependent dealloying of the Cu/Ag islands.
authors.affiliation: Institute for Solid State Physics, Division of Atomic and Molecular Structures (ATMOS), Leibniz University of Hannover, Appelstraße 2, D-30167 Hannover, Germany. zaum@fkp.uni-hannover.de
authors.forename: Christopher
authors.initials: C
authors.lastname: Zaum
authors.forename: Michael
authors.initials: M
authors.lastname: Rieger
authors.forename: Karsten
authors.initials: K
authors.lastname: Reuter
authors.forename: Karina
authors.initials: K
authors.lastname: Morgenstern