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• W2000873779 abstract "Phase change materials have great potential for data storage applications owing to the large optical and electrical contrasts during rapid switching between their amorphous and crystalline phases. Hence, significant efforts have been made to identify and understand their unique characteristics. Here, we report a distinct optical characteristic of phase change materials and explain its presence via electronic structure considerations. The optical response of phase change materials and non-phase change materials are investigated via experiments. Annealing them from room temperature to 400 °C, we observed that Sb2Te3 exhibits phase change properties but not Bi2Te3, despite their similar crystal structures. A red shift in the absorption spectra is observed for crystalline Sb2Te3 with respect to its amorphous phase. From first-principles calculations, we explain that the delocalized electrons in crystalline Sb2Te3 films are responsible for this red shift. In contrast, the electrons in Bi2Te3 films are localized and no absorption red shift is observed. The absorption red shift is also observed in other phase change materials from the GeTe–Sb2Te3 pseudo-binary system; hence the detection of such a red shift may be used for identifying potential phase change materials." @default.
• W2000873779 created "2016-06-24" @default.
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• W2000873779 date "2013-03-01" @default.
• W2000873779 modified "2023-10-18" @default.
• W2000873779 title "Optical response characteristics arising from delocalized electrons in phase change materials" @default.
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• W2000873779 doi "https://doi.org/10.1016/j.actamat.2012.11.050" @default.
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