[Pw_forum] a question about electron-phonon coupling
giannozz at nest.sns.it
Fri Sep 29 13:54:22 CEST 2006
On Sep 29, 2006, at 13:31 , li quan wrote:
> Dear Polo,
> Thanks for your and others' answers, you say that
> >electron-phonon coefficients are seto to zero
> > for phonons whose frequency is smaller than 20 cm^-1
> But, if I want to get the value of electron-phonon coefficients for
> phonons whose frequency is smaller than 20 cm^-1. What should I do?
> Could I reduce the value of "eps"?
the idea behind the cutoff at 20 cm^-1 is to get rid of acoustic phonons
at q=0 (whose contribution to the el-ph coupling is zero anyway).
If you have "real" phonons with frequency < 20 cm^-1 , you may try
to reduce the value of eps, but I guess it will be hard to get an
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