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Reflectance and thermoreflectance spectra and energy band structure of GeSe crystals
Author(s) -
Valiukonis G.,
Gashimzade F. M.,
Guseinova D. A.,
Krivaitė G.,
Kulibekov A. M.,
Orudzhev G. S.,
Šileika A.
Publication year - 1983
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221170108
Subject(s) - orthorhombic crystal system , spectral line , pseudopotential , electronic band structure , dielectric , dipole , materials science , molecular physics , condensed matter physics , optics , chemistry , diffraction , physics , optoelectronics , organic chemistry , astronomy
The reflectance spectra of orthorhombic GeSe crystals are studied in the region 0.5 to 12 eV in polarized light with E ∥ a and E ∥ b at 290 K and a Kramers‐Kronig analysis is performed. The thermoreflectance spectra are investigated in the region 1 to 5 eV for E ∥ a and E ∥ b at 300 and 90 K. The energy band structure calculations of GeSe are carried out by the pseudopotential method, and the spectra of the imaginary part of the dielectric constant are calculated by the k · p method. A classification and interpretation of main structures of optical spectra of GeSe by direct interband transitions at critical points T, U, T and high symmetry lines B' V, A is presented on the basis of calculated band structure and selection rules for optical dipole transitions of orthorhombic A 4 B 6 crystals.