Dimer charge asymmetry determined by photoemission from epitaxial Ge on Si(100)-(2×1)
- 14 October 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 67 (16) , 2187-2190
- https://doi.org/10.1103/physrevlett.67.2187
Abstract
The charge asymmetry between the up and down atoms of an asymmetric dimer on Si(100)-(2×1) or Ge(100)-(2×1) is tied to the core-level energy splitting. Previous studies of the surface components in the core-level photoemission spectra disagreed on the assignments of the atomic origins, resulting in a disagreement on the charge asymmetry. The present core-level study of the growth of Ge on Si(100) shows clearly that the dimers are essentially covalent.Keywords
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