[Pw_forum] electron-phonon coupling tutorial

[Hua Bao]

Dear Paolo Giannozzi and other QE users,

Thanks for the information. It helps a lot.
I have one follow up question regarding the e-ph coupling calculation.

In the formulation I found on the attached document or the QE website, the
quantity gamma or lambda is defined on the Fermi surface, so it is not a
function of electron energy.

But in some literature, such as this one,
http://prb.aps.org/abstract/PRB/v81/i12/e121412

people can calculate the scattering rate as a function of electron energy
(see fig 2 or fig 4 in the paper). They claimed that they used Quantum
Espresso for the calculation.

I am wondering how they can do that and what the formulation is for the
scattering rate calculation (for electrons not exactly on the Fermi
surface).

Thanks,
Hua



On Wed, Oct 12, 2011 at 11:41 AM, Paolo Giannozzi <giannozz at democritos.it>wrote:

> On Tue, 2011-10-11 at 13:31 -0400, Hua Bao wrote:
>
> > However, there is very limited information about the input and output
> > of the related module (dynmax, q2r, and lambda, etc). It is not even
> > easy to understand the output format.
>
> input is documented as usual in INPUT_PH.* . Output should be quite
> self-explanatory. Attached, a few notes on the calculated quantities.
>
> > I am wondering if there is any good documentation
>
> there is no good documentation and there will never be any, because
> everybody wants documentation but nobody wants to write it.
>
> P.
> --
> Paolo Giannozzi, IOM-Democritos and University of Udine, Italy
>
>
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