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Abstract : The sound propagation in the gapless semiconductor α Sn is studied in both adiabatic and non-adiabatic regimes within the R.P.A. scheme. It is shown that the sound velocity is the same in both regimes, while the latter is characterized by a q 3-2 sound absorption. The validity of these results when the many-body interactions are taken into account is briefly discussed.

Keywords : acoustic wave absorption acoustic wave velocity elemental semiconductors lattice phonons RPA calculations tin

Autor: S. Giulj R.M. Pick



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