Abstract
We identify via thermodynamic energy minimization the role of subsurface strain (caused by surface reconstruction and dimerization) in the ordering of Ga0.5In0.5P alloys. Depending on the growth conditions, the alloy surfaces can have either β2(2×4), c(4×4) or c(8×6) reconstructions, with characteristic 2×1, 1×2 and 2×3 RHEED patterns. We show that (i) the 1×2 reconstruction will lead to a CuPtA surface ordering, (ii) a 2×1 reconstruction will lead to a CuPtB ordering, (iii) a 2×3 reconstruction will lead to a 3-period ordering, and (iv) single (double) bilayer steps are stable at low (high) anion chemical potential. These results are in good agreement with recent experimental observations.
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Acknowledgments
We thank A. Gomyo and T. Suzuki for useful comments. This work was supported by the Office of Energy Research, Division of Materials Science, U. S. Department of Energy, under contract DE-AC36-83-CH10093.
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Zhang, S.B., Froyen, S. & Zunger, A. Theory of Surface Dimerization-Induced Ordering in GaInP Alloys. MRS Online Proceedings Library 417, 43–48 (1995). https://doi.org/10.1557/PROC-417-43
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DOI: https://doi.org/10.1557/PROC-417-43