Abstract
Renormalizations of the sound velocity and deformation potential of bismuth with anisotropic Fermi surface, through the polarization effects by the Coulomb interaction, are carried out in the random phase approximation. The singuralities which did not appear in the isotropic model come out in the phonon spectra. It is shown that the anomalous behavior occurs in a region of short wave lengths of phonon, assuming that both directions of phonon wave vector and of magnetic field are parallel to the trigonal axis.
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