[Pw_forum] matdyn.modes

[Uri Argaman]

dear QE users and developers
I understand from previous messages that matdyn.modes contain the modes as
displacement of the atoms in the unit cell and I understand that there is a
real part and imaginary part but I don't understand what is the meaning of
the imaginary part of the displacement of the atoms. In addition, in
hexagonal lattice, the branches in the spectrum are represents transverse
and longitudinal modes, or it is mixed?
Thank you very much
Uri Argaman
Ben-Gurion University, Beer-Sheva, Israel
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