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• W2077156654 abstract "Several chalcogenide alloys exhibit a pronounced contrast between the optical absorption in the metastable rocksalt and in the amorphous phase. This phenomenon is the basis for their application in optical data storage. Here we present ab initio calculations of the optical properties of GeTe and ${mathrm{Ge}}_{1}{mathrm{Sb}}_{2}{mathrm{Te}}_{4}$ in the two phases. The analysis of our computations and experimental data reveal the correlation between local structural changes and optical properties as well as the origin of the optical contrast in these materials. We find that the change in optical properties cannot be attributed to a smearing of transition energies as commonly assumed for amorphous semiconductors: the optical contrast between the two phases can only be explained by significant changes in the transition matrix elements." @default.
• W2077156654 created "2016-06-24" @default.
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• W2077156654 date "2007-06-06" @default.
• W2077156654 modified "2023-10-11" @default.
• W2077156654 title "Origin of the Optical Contrast in Phase-Change Materials" @default.
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• W2077156654 doi "https://doi.org/10.1103/physrevlett.98.236403" @default.
• W2077156654 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17677924" @default.
• W2077156654 hasPublicationYear "2007" @default.
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