Island Shape Controls Magic-Size Effect for Heteroepitaxial Diffusion
Materials Science
2010-08-02 v1
Abstract
Lattice mismatch of Cu on Ag(111) produces fast diffusion for special "magic sizes" of islands. A size- and shape-dependent reptation mechanism is responsible for low diffusion barriers. Initiating the reptation mechanism requires a suitable island shape, a property not considered in previous studies of 1D island chains and 2D closed-shell islands. Shape determines the dominant diffusion mechanism and leads to multiple clearly identifiable magic-size trends for diffusion depending on the number of atoms whose bonds are shortened during diffusion.
Cite
@article{arxiv.0908.3006,
title = {Island Shape Controls Magic-Size Effect for Heteroepitaxial Diffusion},
author = {Henry H. Wu and A. W. Signor and Dallas R. Trinkle},
journal= {arXiv preprint arXiv:0908.3006},
year = {2010}
}
Comments
9 pages, 3 figures