[Pw_forum] a question about electron-phonon coupling

Malgorzata Wierzbowska wierzbom at ts.infn.it
Fri Sep 29 13:36:30 CEST 2006

On Fri, 29 Sep 2006, li quan wrote:

  No, if you reduce eps, for smaller frequency phonons you will get
el-ph in which you cannot trust, too large - as I wrote before.
It is better to calculate some "grid" of phonons and use q2r and matdyn.
Than you will get also small frequency phonons with a good result.
You need to apply the accustic phonon sum rule.
For optical phonons no problem.


> 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"?
> Thanks in advance.
> gao

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