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Optical properties of cubic and rhombohedral GeTe
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View: Figures


Image of FIG. 1.
FIG. 1.

Calculated band structure of cubic GeTe (top) and rhombohedral ferroelectric GeTe showing the non-equivalent Γ-L directions (bottom). The points “L1” and “L2” are the fcc L points along the rhombohedral -axis and non--axis directions, respectively. Note the differences between these two directions, e.g., in the dispersion of the lowest conduction band from Γ. The direct band gaps at “L1” and “L2” are 0.61 eV and 0.53 eV, respectively, while the indirect gap from the valence band at “L1” to the conduction band at “L2” is 0.45 eV. The lowest indirect gap is from a valence band away from a symmetry point approximately along a line joining an “L1” to an “L2” point to the “L2” point conduction band and is 0.38 eV.

Image of FIG. 2.
FIG. 2.

Calculated optical reflection for cubic and rhombohedral ferroelectric GeTe. For the rhombohedral case, “zz” denotes polarization along the ferroelectric polar axis, while “xx” denotes in polarization perpendicular to it.

Image of FIG. 3.
FIG. 3.

Calculated -character projections of the electronic density of states of NaCl cubic (c) and rhombohedral (r) GeTe onto the Ge and Te LAPW spheres. The energy zero is set to the valence band maximum.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical properties of cubic and rhombohedral GeTe