Scientific article
Open access

Do we know the true structure of Ge(111)c(2x8) ?

Published inPhysical review letters, vol. 69, no. 4, p. 648-651
Publication date1992

We present the first ab initio determination of the surface structure and electronic properties of Ge(111)c(2×8). New features emerge, in addition to the basic adatom–rest-atom architecture. In agreement with LEED, which shows weak but nonvanishing quarter-order reflections, we find that an asymmetry is present in the surface unit cell, related to a small buckling between the two rest atoms, as well as to in-plane asymmetries of the rest atoms, adatoms, and first bilayer atoms. This inequivalance also produces a splitting of both the rest-atom and the adatom dangling-bond states, which explains the difference in their apparent heights as seen recently with scanning tunneling microscopy.

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Citation (ISO format)
TAKEUCHI, Noboru, SELLONI, Annabella, TOSATTI, Erio. Do we know the true structure of Ge(111)c(2x8) ? In: Physical review letters, 1992, vol. 69, n° 4, p. 648–651. doi: 10.1103/PhysRevLett.69.648
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ISSN of the journal0031-9007

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