Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7907836 | Optical Materials | 2018 | 9 Pages |
Abstract
Ground and excited states of four excitonic series (A, B, C and D) were discovered in HgGa2Se4 crystals at 10 K. Parameters of excitons and bands were determined. An effective mass of electrons mc is equal to 0.26m0 and masses of holes mv1, mv2 and mv3 are equal to 2.48m0, 2.68m0 and 1.6m0 respectively in Î point of Brilloin zone. Valence bands splitting by crystal field (Îcf = 70 meV) and spin-orbital interaction (Îso = 250 meV) were estimated in Brillouin zone center. Optical functions (n, ε1 and ε2) for polarizations Eâ¥c and E||c in electron transitions region (2-6 eV) were calculated by Kramers-Kronig method. The discovered features were discussed on a base of the existing theoretical energetical band structure calculations and excitonic bands symmetries in k = 0 Brillouin zone for chalcopyrite crystals. The resonance Raman scattering was investigated.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
N.N. Syrbu, V.V. Zalamai,