Excitonic Polaritons in ZnAs₂

Abstract

The allowed exciton transitions n=1,2,3 were revealed in the reflection spectra of ZnAs2 monocrystals at 10 K. Transverse and longitudinal exciton energies, longitudinal splitting value, translation and reduced exciton masses, electron and hole effective masses were revealed from fitting of the exciton spectra. Absorption spectra and absorption interference were studied for E∥c and E⊥c polarizations for thin samples. The polariton branches of exciton polaritons were calculated from the experimental results.

Luminescence at the axial centers of CdP2-D48 crystals

“…These wavelengths are located in the region of the edge absorption beginning, where there is a change in electronic transitions (indirect, direct), responsible for edge absorption. As mentioned above, the optical properties of the tetragonal CdP 2 have been studied in many research works, where the indirect nature of the minimum energy gap and the magnitudes and the energies of the phonons participating in the transition are determined [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ].…”

“…Cadmium diphosphide (CdP 2 ) belongs to the group of wide-gap А II В V semiconductor materials and possess a natural gyrotropy and anisotropy [ 1 , 2 , 3 ]. Reflection, absorption and photoluminescence spectra in the electronic transitions and vibrational modes region are observed [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. The values of the nonlinear polarization and gyrotropy of CdP 2 are higher than those of other crystals, providing an effective stabilization of the radiation field simultaneously in space (cross section) and in time [ 13 , 14 , 15 , 16 ].…”

“…[ 19 , 20 ] and the possibility of creating magneto-optical modulators based on CdP 2 , sensitive elements for measuring magnetic field induction was demonstrated. On the basis of CdP 2 crystals a technology for obtaining p-n junctions of surface-barrier diodes has been developed [ 2 , 3 , 5 , 6 , 7 , 8 , 9 ]. Photoelectron emitters and photodiodes [ 21 , 22 , 23 ], electric switches [ 24 , 25 ] and Zener diodes [26] have been developed on the basis of the CdP 2 single crystals.…”

“…The technology of Me-CdP 2 Schottky diodes obtaining has been developed, electric and photoelectric characteristics of diodes have been investigated, where In, Cu, Pt, Ga, Pb, Sb, Ag, Te, Au, Hg were used as metals. The parameters and properties of Schottky diodes are determined in a wide range of temperatures and light waves [ 2 , 3 , 5 , 6 , 7 , 8 , 9 ].…”