[Pw_forum] Phonon eigenvector normalization

[Jiseok Kim]

I am trying to calculate the electron-phonon scattering rate in k-space
using the phonon eigenvalues and eigenvectors calculated from matdyn.x.
So I read the eigenvalues and eigenvectors from the output file (i.e.
matdyn.modes) and I check the normalization of the eigenvectors at a given
phonon wavevector q and phonon mode /eta by summing the square of absolute
value of eigenvectors over all the atoms.

When I calculate the electron-phonon interaction, I use the polarization
vector which is conventionally denoted as 'e^{\alpha}_{q,\eta}' for an atom
\alpha at a given q and mode \eta.

Here I wonder if I can use the phonon eigenvectors directly calculated from
'matdyn.x' as my polarization vector  'e^{\alpha}_{q,\eta}'.
Or do I have to re-normalize the eigenvectors by multiplying masses somehow?

Thank you.

JISEOK KIM, Ph.D.
Postdoctoral Research Associate
Department of Materials Science and Engineering
University of Texas at Dallas
800 W. Campbell Rd. RL10
Richardson, TX 75080
(413)386-6285


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