کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7932471 | 1512614 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The band structure of birefractive CdGa2S4 crystals
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
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چکیده انگلیسی
In this paper, we report on the spectral dependence of În=noâne for CdGa2S4 single crystals for shorter and longer wavelengths than the isotropic wavelength λ0=485.7 nm (300 K). It was established that În is positive at λ>λ0 and it is negative in the spectral range λ<λ0. The isotropic wavelength λ0 exhibits blue spectral shift with temperature decreasing. The ground and excited states of three excitonic series A, B and C with binding energies of 53 meV, 52 meV and 46 meV, respectively, were found out at 10 K. The effective masses of electrons for k=0 were derived from the calculation of excitonic spectra: mcâ¥(Ðâ¥Ñ)=0.21m0 and mcâ¥(Ðâ¥Ñ)=0.19m0. The holes masses are equal to 0.59m0 and 0.71m0 for Ðâ¥Ñ and Ðâ¥Ñ, respectively. The value of valence bands splitting, V1âV2, by crystalline field equals 24 meV, and V2âV3 splitting due to the spin-orbital interaction equals to 130 meV. The optical functions n, k, ε1 and ε2 for Ðâ¥Ñ and Ðâ¥Ñ polarizations were calculated by means of Kramers-Kronig analyses in the energy interval 3-6 eV. The evidenced features are discussed taking into account the results of new theoretical calculations of CdGa2S4 band structure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 309, 15 November 2013, Pages 205-211
Journal: Optics Communications - Volume 309, 15 November 2013, Pages 205-211
نویسندگان
I.G. Stamov, N.N. Syrbu, V.I. Parvan, V.V. Zalamai, I.M. Tiginyanu,