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Exciton Contribution to Oscillatory Magnetophotoconductivity in Ge
Author(s) -
Kessler F. R.,
Olsowski W.
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.2220890208
Subject(s) - exciton , spectral line , absorption spectroscopy , absorption (acoustics) , maxima , biexciton , doping , recombination , dissociation (chemistry) , molecular physics , chemistry , atomic physics , materials science , condensed matter physics , physics , optics , quantum mechanics , art , biochemistry , performance art , gene , art history
Abstract In the region of direct interband transitions, two types of oscillatory magnetophotoconductivity (MPC) spectra of lightly n‐doped Ge samples of various thickness exist. First, there is a correlative spectral dependence, wherein the MPC maxima correspond to magnetoabsorption peaks, and secondly, anticorrelative spectra, which have mimima at positions of absorption maxima. From this the contribution of excitons to the MPC in Ge is deduced. Further analyses of the temperature dependence of MPC, and investigations of external influences such as additional illumination support the assumption that primarily excitons are generated by the absorption mechanism. In a secondary process these excitons may either dissociate into free carriers or recombine instantaneously. If the recombination overbalances the dissociation there is a selective defect in the quantum efficiency of the MPC at each exciton absorption line. Calculations based on the continuity equation and taking the different generation and reduction processes into consideration confirm the spectral conversion of MPC spectra.