Stacking fault and four-body interaction in the Si(111)7×7 structure

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Abstract
A four-body interaction is introduced to investigate the corrugation due to the stacking fault in a model of the Si(111)7×7 structure, the dimer-adatom stacking-fault model. It is found that the four-body interaction can explain the difference of atomic displacement due to the stacking fault, while two- and three-body interactions cannot, although they cause the displacement of atoms especially near adatoms and dimers. However, the difference obtained is insufficient quantitatively to explain the asymmetry of the terraced structure of the experiment, that is, the calculated 7×7 unit cell is essentially symmetric.