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American Journal of Materials Research

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Excitonic Polaritons and Electronic Band Structure of CdAl₂S₄ Single Crystals

American Journal of Materials Research
Vol.4 , No. 2, Publication Date: Aug. 8, 2017, Page: 7-14

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Authors

[1]	Nicolae Syrbu, Department of Telecommunication, Technical University of Moldova, Chisinau, Republic of Moldova.
[2]	Victor Zalamai, Laboratory of Materials for Photovoltaics and Photonics, Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Republic of Moldova.
[3]	Valerian Dorogan, Department of Telecommunication, Technical University of Moldova, Chisinau, Republic of Moldova.

Abstract

Reflection and wavelength modulated reflection spectra were investigated at temperature 10 K in CdAl₂S₄ crystals. Ground and excited states of three excitonic series (A, B and C) were found out. Contours of excitonic reflection spectra were calculated and main parameters of excitons and bands in k = 0 were determined. The effective mass of electrons m_c is equal to 0.30m₀ and holes masses m_v1, m_v2 and m_v3 are equal to 1.55m₀, 0.90m₀ and 2.07m₀, respectively in Γ point of Brillouin zone. Valence bands V₁ - V₂ splitting due to crystal field (141 meV) and bands V₂ - V₃ splitting by spin-orbital interaction (152 meV) were estimated. Spectral dependences of optical functions (n, k, ε₁ and ε₂) were determined by Kramers-Kronig analysis of reflection spectra measured at energies 3 - 6 eV and in Ec and E||c polarizations. Energies of direct electron transitions were determined and identified in the actual points of Brillouin zone in the framework of actual band structure theoretical calculations of CdAl₂S₄.

Keywords

Excitons, Electron and Hole Effective Masses, Birefractive Effects, Isotropic Wavelength, Kramers-Kronig Analysis

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