[Pw_forum] About the deformation potential approximation and elctron-phonon coupling

[Jun Dai]

Dear QE users,

Recently, I heard about that the deformation potential approximation as implemented in QE may not work
to deal with the electron-phonon coupling at high frequencies, but I don't quite understand the physics
lie in, since QE seems to work fine in phonon mediated superconductors such as boron-doped diamond. I am 
wondering if QE do fail to deal with the el-ph coupling at high frequencies? if so, what is this high 
frequencies stand for(in what range?), or in what cases we can use the el-ph method implemented in QE? 
I would also appreciate those who can provide some backgroud methodology in this area. Thanks in advance.

Best regards，

Jun DAI
 

--
=================================================
 Jun DAI
 Ph.D Candidate
 Hefei National Laboratory for Physical Sciences at the Microscale
 University of Science & Technology of China
 Hefei, Anhui 230026, P.R.China
 Tel.: +86-551-3606428
=================================================