integrated electron-phonon coupling strength λ

[anyipeng]

Dear Sir,

As follwing the example of MgB2 (https://docs.epw-code.org/doc/MgB2.html) by QE 6.6, how to obtain the data of integrated electron-phonon coupling strength λ to plot the Fig. 2?

Thanks.

[hpaudya1]

Hi anyipeng,

This is obtained as;
λ=∫(2 α^2 F(ω))/ω dω

where,
ω is 1st column of MgB2.a2f
α^2 F(ω) is 2nd column of MgB2.a2f (for the 1st smearing value and 3rd, 4th, ... up to 10 smearing values)

This is already updated in the development version of EPW (https://gitlab.com/QEF/q-e)

Please note that we should sign the posts with names and affiliations.

Best,
Hari Paudyal

[anyipeng]

Thank you, Dr. Paudyal.

The development-version works now.

Thanks again. I am new user of QE and EPW.

anyipeng