From the figures for the phonon dispersion curves for Si and GaAs plus the equations for optical
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From the figures for the phonon dispersion curves for Si and GaAs plus the equations for optical and acoustic phonons, explain why the energy for the Si curves is higher in energy than the curves for GaAs? Assume that the elastic constant is about the same for both materials. Also, why do the optical and acoustic phonon branches cross at the zone boundary for Si but not for GaAs?
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The energy of the phonon dispersion curves is directly related to the elastic con...View the full answer
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