Role of chemical potentials in surface reconstruction: A new model and phase transition of GaAs(111)2x2
- 30 June 1986
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 56 (26) , 2819-2822
- https://doi.org/10.1103/physrevlett.56.2819
Abstract
The role of chemical potentials in surface reconstructions is examined and shown to be crucial for binary semiconductor srufaces such as GaAs(111)2×2. We predict that under As-rich conditions a new model, the As triangle, is the lowest-energy geometry, whereas the Ga-vacancy model is appropriate for Ga-rich conditions. A change in the relative chemical potential of Ga and As should produce a phase transition between the two structures.Keywords
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