Ab initio calculations of optical constants of GaSe and InSe layered crystals

作者：Sarkisov S Yu^*; Kosobutsky A V; Brudnyi V N; Zhuravlev Yu N

来源：Physics of the Solid State, 2015, 57(9): 1735-1740.

DOI：10.1134/S1063783415090309

The dielectric functions, refractive indices, and extinction coefficients of GaSe and InSe layered crystals have been calculated within the density functional theory. The calculations have been performed for the values of theoretical structural parameters optimized using the exchange-correlation functional, which allows one to take into account the dispersion interactions. It has been found that optical functions are characterized by the most pronounced polarization anisotropy in the range of photon energies of similar to 4-7 eV. The frequency dependences for InSe compound in the range up to 4 eV demonstrate the more pronounced anisotropy as compared to GaSe. The results obtained for GaSe crystal agree better with the experimental data as compared to the previous calculations.

• 出版日期2015-9