[Pw_forum] LO-TO splitting

[Reza Ebraahimi]

Hello everyone
i have a question about the LO-TO splitting. Imagine an insulator or semiconducting bulk material that has no degenerate phonon mode at Gamma point (no "E" or "T" species after diagonalizing the Dynamical matrix). Should this bulk exhibit LO-TO splitting? Cause in this case, the # of the optical modes becomes more than 3N-3, right?
Thank You in Advance

R. Ebraahimi
Graduate Student- Tehran University



      
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