Negative-Ucharacter of the adsorption on semiconductor surfaces: Application to metals on GaAs(110)
- 4 March 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 66 (9) , 1209-1211
- https://doi.org/10.1103/physrevlett.66.1209
Abstract
General arguments are presented which tend to show that adatom-substrate bonds are likely to exhibit negative-U behavior. This is confirmed by a direct calculation for Au and GaAs(110). It is shown that a natural consequence of this is the pairing of adatoms as observed in scanning-tunneling-microscopy experiments. The distance in energy between the two ionization levels of the pair is correctly predicted as well as the sign of the tunnel current.Keywords
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