Excitonic spectra in HgGa 2 Se 4 crystals
| Autor: | V.V. Zalamai, N.N. Syrbu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Physics Valence (chemistry) Exciton Organic Chemistry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Inorganic Chemistry Brillouin zone symbols.namesake Effective mass (solid-state physics) Atomic electron transition Excited state 0103 physical sciences symbols Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Electronic band structure Spectroscopy Raman scattering |
| Zdroj: | Optical Materials. 76:344-352 |
| ISSN: | 0925-3467 |
| Popis: | 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 Γ point of Brilloin zone. Valence bands splitting by crystal field (Δcf = 70 meV) and spin-orbital interaction (Δso = 250 meV) were estimated in Brillouin zone center. Optical functions (n, e1 and e2) for polarizations E⊥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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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