<div dir="ltr"><div><div><div><div>Dear<b><br><br></b></div>I
am Muhammad Nadeem, a master degree student in department of physics at
Sungkyunkwan University South Korea. I am working on el-ph calculation
of alkali doped organic superconductor. I am using Quantum Espresso code
for that. I have some trouble while using <b>electron_phonon='interpolated'</b>
in PHonon package. As you can expect that my system is quite large and
when I use this interpolation routine even with 2x2x2 q-points and 4x4x4
k-points it gets stuck at electron-phonon stage. My calculation goes
very well If I use <b>electron_phonon='simple'.</b> I am using <b>ibrav=0. </b>Is this happening
because interpolation routine does not work in parallel on multiple cpu?
Is there some remedy for my problem with this interpolation scheme. As
you can expect I can't go for very high number of q-points for dfpt
calculation and hence my double delta integration for electron-phonon
vertices converges at very high smearing (degauss=0.4Ry) if I use
electron_phonon='simple'. Interpolation is the only option left for my
calculation. Please give some comments on smearing too. As I understand
that this is broadening over electron bands around fermi level so
0.4Ry=5.4eV is too large to give physical electron-phonon coupling
parameter. Is it true? if so then please suggest me some solution to
tackle this issue.<br><br></div>Looking forward to listen your comments on this issue. Thank you for your time.<br><br></div>Best Regards<br clear="all"></div>Nadeem<br><div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><b><span style="color:rgb(68,68,68)"><i>Muhammad Nadeem<br></i></span></b></div><div><b><span style="color:rgb(68,68,68)"><i>Graduate Student<br></i></span></b></div><b><span style="color:rgb(68,68,68)"><i>Department of Physics <br>Sungkyunkwan University, Suwon</i></span></b><br></div></div>
</div></div>