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Optical Selection Rules for Hexagonal GaN

✍ Scribed by P. Tronc; Yu.E. Kitaev; G. Wang; M.F. Limonov; A.G. Panfilov; G. Neu

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
120 KB
Volume
216
Category
Article
ISSN
0370-1972

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✦ Synopsis

We determined the possible symmetries for band (Bloch) states at various points of the Brillouin zone. The spinΒ±orbit interaction has been taken into account. Free excitons offer larger sets of possible state symmetries than single carriers do. The selection rules for the optical transitions have been established. Experiments with polarized light are shown to be relevant to study the nature (s or p) of A, B, and C excitons.

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Temperature Dependence of Hexagonal-GaN
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First, spectroscopic ellipsometry (SE) is carried out at 300 K together with reflectivity measurements versus temperature from 4 to 300 K, in order to determine the temperature dependence of the refractive index of h-GaN films in the transparent region (350 to 600 nm). The SE measurements are carrie