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• W3159562955 abstract "We present ab initio calculations of the electronic and optical properties of hexagonal SiGe alloys in the lonsdaleite structure. Lattice constants and electronic band structures in excellent agreement with experiment are obtained using density-functional theory. Hexagonal Si has an indirect band gap, while hexagonal Ge has a pseudo-direct gap, i.e. the optical transitions at the minimum direct band gap are very weak. The pseudo-direct character of pure hexagonal Ge is efficiently lifted by alloying. Already for a small admixture of Si, symmetry reduction enhances the oscillator strength of the lowest direct optical transitions. The band gap is direct for a Si content below 45 %. We validate lonsdaleite group-IV alloys to be efficient optical emitters, suitable for integrated optoelectronic applications." @default.
• W3159562955 created "2021-05-10" @default.
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• W3159562955 date "2021-05-05" @default.
• W3159562955 modified "2023-10-17" @default.
• W3159562955 title "From pseudo-direct hexagonal germanium to direct silicon-germanium alloys" @default.
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• W3159562955 hasPublicationYear "2021" @default.
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