Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5426041 | Surface Science | 2007 | 5 Pages |
Based on the results of scanning tunneling microscopy studies of the reconstructed Si(5Â 5Â 12)-2Â ÃÂ 1 surface, its atomic structure has been found. It turns out that Si(5Â 5Â 12)-2Â ÃÂ 1 consists of four one-dimensional structures: honeycomb (H) chain, Ï-bonded Hâ² (Ï) chain, dimer-adatom (D/A) row, and tetramer (T) row. Its period is composed of three subunits, i.e., (i) (3Â 3Â 7) unit with a D/A row [D(3Â 3Â 7)], (ii) (3Â 3Â 7) unit with a T row [T(3Â 3Â 7)], and (iii) (2Â 2Â 5) unit with both a D/A and a T row. Two kinds of adjacent subunits, T(3Â 3Â 7)/D(3Â 3Â 7) and D(3Â 3Â 7)/(2Â 2Â 5), are divided by H chains with 2Ã periodicity due to buckling, while one kind of adjacent subunits, T(3Â 3Â 7)/(2Â 2Â 5), is divided by a Ï chain with 1Ã periodicity. Two chain structures, H and Ï chains, commute with each other depending upon the external stresses perpendicular to the chain, which is the same for two row structures, D/A and T rows. It can be concluded that the wide and planar reconstruction of Si(5Â 5Â 12)-2Â ÃÂ 1 is originates from the stress balance among two commutable chains and two commutable rows.