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- W2034795699 abstract "A semiempirical tight-binding method in the $s{p}^{3}{s}^{*}$ model is used to investigate the electronic and optical properties of strained and unstrained wurtzite GaN ($ensuremath{alpha}$-GaN). The calculated unstrained fundamental gap of $ensuremath{alpha}$-GaN is 3.45 eV, which is in agreement with experiment. The empirical scaling rule has been used in the strained band-structure calculation, where the strains cover -5-5%. The band gap at the $ensuremath{Gamma}$ point increases with the absolute value of strains. GaN has an indirect band gap when strains reach 5%. The unstrained and strained density of states and imaginary part of the dielectric function [${ensuremath{epsilon}}_{2}(ensuremath{omega})$] are studied. There are mainly three peaks at 6.4, 7.5, and 8.4 eV dominating the unstrained ${ensuremath{epsilon}}_{2}(ensuremath{omega})$ spectrum, whose two components, ${ensuremath{epsilon}}_{2xy}(ensuremath{omega})$ and ${ensuremath{epsilon}}_{2z}(ensuremath{omega})$, are also calculated. Both the shape and energy position of the peaks of the ${ensuremath{epsilon}}_{2}(ensuremath{omega})$ successively change with the strains. The real part of the dielectric function, reflectivity, refractive index, and the effects of the strains on them are all researched." @default.
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- W2034795699 date "1996-12-15" @default.
- W2034795699 modified "2023-10-14" @default.
- W2034795699 title "Electronic and optical properties of unstrained and strained wurtzite GaN" @default.
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- W2034795699 doi "https://doi.org/10.1103/physrevb.54.17577" @default.
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