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Birefringence and exciton spectra of CuAlSe2 and CuAlS2 crystals

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dc.contributor.author MAŞNIC, Alisa
dc.date.accessioned 2020-06-10T09:19:57Z
dc.date.available 2020-06-10T09:19:57Z
dc.date.issued 2020
dc.identifier.citation MAŞNIC, Alisa. Birefringence and exciton spectra of CuAlSe2 and CuAlS2 crystals. In: Journal of Engineering Science. 2020, Vol. 27(1), pp. 23-27. ISSN 2587-3474. eISSN 2587-3482. en_US
dc.identifier.issn 2587-3474
dc.identifier.issn 2587-3482
dc.identifier.uri https://doi.org/10.5281/zenodo.3713358
dc.identifier.uri http://repository.utm.md/handle/5014/8868
dc.description.abstract The excitonic reflection spectra of CuAlS2 and CuAlSe2 crystals were measured at the temperature of 10 K for polarizations E||c and Ec. Ground and excited states of the excitons were found out in the investigated spectra. Symmetries of the observed excitons were determined. The shapes of ground states lines of Г4 and Г5 excitons were calculated by means of the Kramers-Kronig relations. Exciton parameters and values of energetic gaps (Г7-Г6, Г6-Г6, and Г7-Г6) were determined. Optical reflection spectra in the depth of absorption band (Еg - 6 eV) were measured at 80 K for E||c and Ec polarizations. Optical constants were calculated from measured reflection spectra by Kramers-Kronig analysis. The phase in the excitonic region was determined. Transmission spectra of CuAlSe2 single crystals deposit in crossed polarizers demonstrate a birefractive effect. In the case of parallel polarizers interference due to birefraction was observed. The isotropic point was determined. en_US
dc.description.abstract Spectrele excitonice de reflecţie ale cristalelor CuAlS2 și CuAlSe2 au fost măsurate la temperatura de 10 K pentru polarizările E || c și Ec. În spectrele cercetate au fost descoperite stări de bază și nivelele excitonice. S-au determinat simetriile excitonilor observaţi. Formele liniilor stărilor de bază ale excitonilor Г4 și Г5 au fost calculate prin intermediul relaţiilor Kramers-Kronig. S-au determinat parametrii și valorile excitonului lacunelor energetice (Г7- Г6, Г6- Г6 și Г7- Г6). Spectrele de reflecţie optică în adâncimea benzii de absorbţie (Еg - 6 eV) au fost măsurate la 80 K pentru polarizările E || c și Ec. Constanţele optice au fost calculate din spectrele de reflecţie măsurate prin analiza Kramers-Kronig. Faza în regiunea excitonică a fost determinată. Spectrele de transmisie ale compusului CuAlSe2 în polarizatoare încrucișate demonstrează un efect birefractiv. În cazul polarizatorilor paraleli s-a observat interferenţa datorată birefracţiei. A fost determinat punctul izotrop al cristalelor. ro
dc.language.iso en en_US
dc.publisher Tehnica UTM en_US
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject absorption spectra en_US
dc.subject reflection spectra en_US
dc.subject excitons en_US
dc.subject polaritons en_US
dc.subject birefringence en_US
dc.subject spectre de absorbţie en_US
dc.subject spectre de reflecţie en_US
dc.subject excitoni en_US
dc.subject polaritoni en_US
dc.subject birefringenţă en_US
dc.title Birefringence and exciton spectra of CuAlSe2 and CuAlS2 crystals en_US
dc.type Article en_US


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