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On the Experimental Determination of Many‐Particle Effects at Interband Transitions
Author(s) -
Jungk G.
Publication year - 1981
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.2221050214
Subject(s) - spectral line , exciton , dielectric function , computation , particle (ecology) , dielectric , range (aeronautics) , electron , physics , condensed matter physics , computational physics , materials science , quantum mechanics , mathematics , oceanography , algorithm , geology , composite material
The energy‐derivative spectra of the real and imaginary part of the dielectric function ε(ω) = ε 1 + i ε 2 in the range of critical interband transitions can be used to determine a parameter which describes the influence of many‐particle effects. Afterwards the computation of the one‐electron spectra becomes possible from experimental spectra, which are modified by many‐particle interactions. The application of this procedure to ellipsometrically determined spectra of GaP and GaAs for the E 1 transition results in the predominant influence of the continuum—exciton effect in accordance with theoretical predictions of Hanke and Sham.