Abstract
A dimer adatom stacking-fault model for the Si(111)-7×7 reconstructed surface structure is described as a network of walls and domains. The wall consists of a chain of dimers and the domain of adatom clusters and adatoms arranged locally in a 2×2 structure on a ‘‘1×1’’ surface lattice. It is shown that with a proper wall configuration (dimer chain), a new structure model for the Ge(111)-2×8 reconstructed surface can be made. The structure, which has four adatom clusters and three dimers in a unit cell with only four dangling bonds, is consistent with the scanning tunneling-microscopy image and electron-diffraction data. A dimer-chain structure which describes reconstructed structures of n×n with odd periodicity and 2×m with even periodicity is presented.
- Received 25 November 1985
DOI:https://doi.org/10.1103/PhysRevB.34.1034
©1986 American Physical Society