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- W2017994087 abstract "Two possibilities for explaining the superlattices of (111) surfaces of Si(7 × 7) and Ge(2 × 8) are considered. The equilibrium concentration of surface vacancies is related to the ratio of metallic and directional contributions to vacancy energies. The macroscopic thermo-dynamic explanation based on vacancy concentrations is preferred to an alternate microscopic one based on excitonic instabilities. A relation between anisotropy of surface energies and vacancy concentrations is proposed that predicts new superlattices for Si (100) 2 × 1, (110) 2 × 1, 5 × 1 and 4 × 5." @default.
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- W2017994087 title "Excitonic instabilities, vacancies, and reconstruction of covalent surfaces" @default.
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- W2017994087 doi "https://doi.org/10.1016/0039-6028(73)90137-4" @default.
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