Surface Reconstruction of Si(111)-7x7/Ge(111)-5x5 and Magic Cluster Formation

The 5x5 reconstruction of Ge(111) occurs only due to strain from the underlying Si(111)-7x7 substrate. Recent studies have shown the presence ``magic clusters" on Si(111)-7x7 and we are interested in studying the mechanism of self-assembly and stability of indium clusters on Ge(111)-5x5. We report results of our first principles plane wave density functional calculations for the Ge(111)-5x5 surface, including the electronic properties of this structure and theoretical predictions of indium magic cluster formation.