| Conţinutul numărului revistei |
| Articolul precedent |
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 85 0 |
 SM ISO690:2012STAMOV, Ivan, SYRBU, Nicolae, URSACHI, Veaceslav, PARVAN, Vladimir, ZALAMAI, Victor. Energy band structure and Frenkel excitons in PbGa 2S 4. In: Optics Communications, 2012, vol. 285, pp. 5198-5204. ISSN 0030-4018. DOI: https://doi.org/10.1016/j.optcom.2012.07.041 |
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  Optics Communications |
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| Volumul 285 / 2012 / ISSN 0030-4018 | ||||||
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| DOI:https://doi.org/10.1016/j.optcom.2012.07.041 | ||||||
| Pag. 5198-5204 | ||||||
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Optical reflection spectra are measured and calculated in PbGa 2S 4 crystals in the region of resonances related to excitons with large oscillator strength and binding energy (Frenkel excitons). The splitting of the upper valence band in the center of the Brillouin zone due to crystal field (Δ cf) and spin orbit (Δ so) interaction are determined. Optical reflection spectra are measured and calculated according to Kramers-Kronig relations in the region of 3-6 eV in ⊥ and ∥ polarizations, and the optical constants n, k, ε 1 and ε 2 are determined. The observed electronic transitions in PbGa 2S 4 crystals are discussed in the frame of theoretical energy band structure calculation for thiogallate crystals. |
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| Cuvinte-cheie Band structure, Excitons, optical absorption, reflection, and luminescence spectra, Optical constants, Semiconductor compound |
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