Anomalous scaling in heteroepitaxial island dynamics on Ag(100) |
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Authors: | Zaum Christopher Rieger Michael Reuter Karsten Morgenstern Karina |
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Affiliation: | Institute for Solid State Physics, Division of Atomic and Molecular Structures (ATMOS), Leibniz University of Hannover, Appelstra?e 2, D-30167 Hannover, Germany. zaum@fkp.uni-hannover.de |
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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. |
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