Abstract
We discuss the validity of various theories of resonant light scattering by phonons. We specially consider the case of an exciton-phonon coupling which is small compared to the exciton-photon coupling. Thus, for a particular choice of additional boundary conditions (ABC) the scattered intensity can be calculated self-consistently with, parameters deduced from the experiments. We discuss several experiments, of the literature and the problem of ABC. Elastic scatterings by defects are also considered.
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The constants entering in the calculation are given in [12]. R. C. Merle, F. Meseguer and M. Cardona presented at the 17th ICPS, San Francisco (U.S.A.), 6–10 August 1984 and to be published. Details will be given elsewhere. The exact definition of the functions Qe(q) and Qh (q) given in [1 … 4] are used in all the calculations of the present paper.
A two-oscillator model is however necessary to explain the behaviour of the TO phonon.
In the calculations of Figs. 5 and 6, we use a two-oscillator model, including the A and B excitons. For A, hωT=2.55 eV and hωL−hωT=1.9 meV. For B, hωT=2.565 eV and hωL−hωT=1.4 meV. For both, the electron and hole masses are: me=0.2 m0, mh=0.63 m0 and the exciton radius is 28 Å, ∈b=8.5. The exchange parameter j and deformation potentials of [28] are used. The interband effects discussed in [28] are included. However, the quantity C2+C4=−1.6 eV of [28] is, in fact, a difference Cc−Cv between a conduction and a valence band deformation potential. A rough estimation, based on a comparison with zinc-blende materials and on the results of [28] leads us to tentatively assume Cc=−7 eV and Cv=−5.4 eV. The other constants are the same as in [9 , 20].
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© 1985 Friedr. Vieweg & Sohn Verlagsgesellschaft mbH
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Merle, JC. (1985). The efficiency of resonant light scattering on excitons. In: Grosse, P. (eds) Festkörperprobleme 25. Advances in Solid State Physics, vol 25. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0108160
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DOI: https://doi.org/10.1007/BFb0108160
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