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Please use this identifier to cite or link to this item: http://hdl.handle.net/10119/16075

Title: First principles study of the electronic and optical properties of crystalline and liquid Sb_2Te_3: Phase-transition-induced changes in optical properties
Authors: Sano, Haruyuki
Kuwahara, Masashi
Mizutani, Goro
Keywords: Sb2Te3
solid-liquid phase transition
electronic and optical properties
Blu-ray Disc
Blu-ray Disc
Issue Date: 2018-07-27
Publisher: IOP Publishing
Magazine name: Japanese Journal of Applied Physics
Volume: 57
Number: 9S1
Start page: 09SD01-1
End page: 09SD01-6
DOI: 10.7567/JJAP.57.09SD01
Abstract: To clarify the mechanism by which the optical properties of Sb_2Te_3 change because of its solid-liquid phase transition, we carried out ab initio calculations of the electronic and optical properties of Sb_2Te_3 in both the crystalline and liquid states. The calculated results indicate that the density of states around the Fermi level increases because of melting and that the energy bandgap observed in the crystalline state consequently disappears. The imaginary part of optical dielectric functions of crystalline Sb_2Te_3 has a large peak at a photon energy of ħω = 1.5 eV. When Sb_2Te_3 melts, it exhibits somewhat metallic optical properties and its optical absorption at ħω = 3.06 eV, which is used in Blu-ray Disc systems, decreases. This decrease in optical absorption is proposed to result from a large reduction of the optical transition strength at ħω ≈ 1.5 eV.
Rights: This is the author's version of the work. It is posted here by permission of The Japan Society of Applied Physics. Copyright (C) 2018 The Japan Society of Applied Physics. Haruyuki Sano, Masashi Kuwahara, and Goro Mizutani, Japanese Journal of Applied Physics, 57(9S1), 2018, 09SD01-1-09SD01-6. http://dx.doi.org/10.7567/JJAP.57.09SD01
URI: http://hdl.handle.net/10119/16075
Material Type: author
Appears in Collections:c10-1. 雑誌掲載論文 (Journal Articles)

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