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Simulation of optical spectra of novel Tl4CdI6 and Tl4HgI6 optoelectronic crystals

Franiv V, Bovgyra O, Kushnir O, Franiv A, Plucinski K J

Optica Applicata

2014

Vol. 44, nr 2

317--326

The results of calculations using local density approximation and generalized gradient approximation: the total energy depending on the volume of the unit cell, the distribution of the total density of states and the partial contributions of electronic orbitals in the band structure of Tl4CdI6 and Tl4HgI6 crystals are shown in this paper. The spectra of the real part of the dielectric permittivity, the spectra of the imaginary part of permittivity, the reflection spectra and the absorption coefficient of both crystals are obtained using the Kramers–Kronig method. A comparative analysis of theoretical calculations with experimental data is carried out. Substantial influence of electron–phonon broadening is shown.