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Excitonic spectra and band structure of CdGa2Se4 birefractive crystals

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dc.contributor.author SYRBU, N. N.
dc.contributor.author STAMOV, I. G.
dc.contributor.author PARVAN, V. I.
dc.contributor.author ZALAMAI, V. V.
dc.contributor.author TIGINYANU, I. M.
dc.date.accessioned 2020-12-29T10:19:35Z
dc.date.available 2020-12-29T10:19:35Z
dc.date.issued 2013
dc.identifier.citation SYRBU, N. N., STAMOV, I. G., PARVAN, V. I. et al. Excitonic spectra and band structure of CdGa2Se4 birefractive crystals. In: Physica B: Condensed Matter, 2013, V. 429, pp. 106-114. ISSN 0921-4526. en_US
dc.identifier.uri https://doi.org/10.1016/j.physb.2013.08.015
dc.identifier.uri http://repository.utm.md/handle/5014/12333
dc.description Access full text – https://doi.org/10.1016/j.physb.2013.08.015 en_US
dc.description.abstract We report on the intersection of spectral dependences of refractive indices no and ne at the wavelengths 546nm (λ0) and 450nm (λ01) in CdGa2Se4 single crystals. The value of difference Δn=ne−no is equal to zero at the wavelengths involved. When placed between two crossed polarizers, the crystals of CdGa2Se4 exhibit a transmission band at the wavelength of λ0=546nm (300K). The ground and excited states of three excitonic series (A, B and C) were found out at 13K in CdGa2Se4 crystals, and other parameters of excitons and bands were determined. In the Г point of Brillouin zone the effective mass of electrons mc is equal to 0.14m0, and the effective masses of holes mv2 and mv3 are equal to 0.76m0 and 0.94m0, respectively. The hole mass mv1 depends upon the direction of wave vector k: at polarization E||c, k||a the mass mv1=1.15m0, and at polarization E||c, k||b mv1=0.84m0. The values of valence bands splitting in the center of Brillouin zone by the crystal field (Δcf=49meV) and spin–orbital interaction (Δso=351meV) were determined. The optical functions n, k, ε1 and ε2 in polarizations E⊥c and E||c for the energy diapason from 3 to 6eV were calculated from the reflectivity spectra by Kramers–Kronig analysis. The evidenced features are discussed on the basis of recent theoretical calculations of the band structure of CdGa2Se4 crystals. en_US
dc.language.iso en en_US
dc.publisher Elservier 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 birefractive crystals en_US
dc.subject crystals en_US
dc.subject semiconductors en_US
dc.subject optical absorptions en_US
dc.subject absorption en_US
dc.subject reflection spectra en_US
dc.subject Kramers–Kronig relations en_US
dc.subject optical constants en_US
dc.subject excitons en_US
dc.subject bands en_US
dc.title Excitonic spectra and band structure of CdGa2Se4 birefractive crystals en_US
dc.type Article en_US


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