Electronic Structures and Optical Properties of GeTe and Ge 2Sb 2Te 5
- 1 June 1998
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 37 (6R), 3327-3333
- https://doi.org/10.1143/jjap.37.3327
Abstract
The optical properties of GeTe and Ge2Sb2Te5 have been studied by means of the density functional theory (DFT) in the local density approximation (LDA). The electronic band structures were obtained by two methods, the plane wave (PW) and spherical wave (SW) expansions of the wave functions. GeTe was calculated to be semiconductive, and Ge2Sb2Te5 to be semimetallic. The frequency dependent optical constants such as refractive index and extinction coefficient were calculated and compared with those obtained experimentally. The origin of the peaks in the extinction coefficient spectra was assigned in terms of the transitions between Ge, Sb and Te p states. Dynamical calculations with respect to Ge2Sb2Te5 have also been performed in order to obtain an understanding of its structural features. The displacements of the Te atoms were found to be larger than those of the Ge and Sb atoms.Keywords
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