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Comparison of Additional Boundary Conditions Based on Thermoreflectance Spectra of the A n =1 ‐Exciton in CdS Crystals at Oblique Incidence
Author(s) -
Stössel W.,
Wagner H. J.
Publication year - 1978
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.2220890210
Subject(s) - exciton , anisotropy , boundary (topology) , symmetry (geometry) , spectral line , condensed matter physics , optical spectra , materials science , optics , molecular physics , boundary value problem , physics , geometry , mathematics , quantum mechanics , mathematical analysis
Thermoreflectance spectra of the A n =1 ‐exciton in CdS are measured at 8 K for angles of incidence of the light ranging from 5° to 85°, using three different spatial arrangements between the c‐axis, the E ‐ and k ‐vector of light. Additional boundary conditions of Pekar, Ting et al. and Agarwal et al. are discussed for the first time in terms of optical constants. The refractive indices for these additional boundary conditions are derived, considering special features of CdS, such as optical anisotropy, exciton symmetry, and effective exciton mass anisotropy. Fitting calculations based on the experimental data show that Pekar's additional boundary condition gives the best agreement between theory and experiment.