<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><font class="Apple-style-span" face="Arial">Hej Zimin, </font></div><div><font class="Apple-style-span" face="Arial"><br></font></div><div><font class="Apple-style-span" face="Arial">Yes I want to get the q-dependent nesting function, the double delta represented by Gaussians (<span class="Apple-style-span" style="-webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">arXiv:cond-mat/0504077v2</span>) to test it against other methods for the the nesting function as </font></div><div><font class="Apple-style-span" face="Arial">introduced in (PRL<span style="font: 12.0px Helvetica"> </span>96,<span style="font: 12.0px Helvetica"> </span>047004 (2006)) and (PHYSICAL REVIEW B<span style="font: 12.0px Helvetica"> </span>71, 064501<span style="font: 12.0px Helvetica"> (</span>2005)). We are currently trying to implement inelastic electron-phonon coupling and very good </font></div><div><font class="Apple-style-span" face="Arial">convergence of the double delta is an issue. Furthermore I would be really interested in how you shift the Fermi energy *within the code*. The derivative </font></div><div><font class="Apple-style-span" face="Arial">of the potential is taken at the Fermi energy - is the shifting after scf cycle? It would be great if you could share more details of the Fermi energy shifting. </font></div><div><font class="Apple-style-span" face="Arial">If it's to detailed don't mind to write at my email (nicki.hinsche(at)physik.uni-halle.de).</font></div><div><font class="Apple-style-span" face="Arial"><br></font></div><div><font class="Apple-style-span" face="Arial">thanks a lot,</font></div><div><font class="Apple-style-span" face="Arial">Nicki</font></div><div><br></div><div><div>-------------------------------------------------------------</div><div>Nicki Frank Hinsche, Dr. rer. nat.</div><div>Institute of physics - Theoretical physics,</div><div>Martin-Luther-University Halle-Wittenberg,</div><div>Von-Seckendorff-Platz 1, Room 1.07<br>D-06120 Halle/Saale, Germany</div><div><div><div>Tel.: ++49 345 5525460</div><div>-------------------------------------------------------------</div></div></div></div><br><blockquote type="cite">Hi Nicki,<br><br>Sorry I didn't quite follow you: as I understand - correct me if I'm wrong - what you are trying to get is a product of delta functions(?!). They don't have any relations whatsoever with electron-phonon interactions. Am I right? If you don't mind, would you like to tell me why you are tring to get this quantity?<br><br>The shifting of Fermi energy is done by manually adding 0.05 electrons *within the code*, rather than tot_charge - in the latter way QE calculates forces and phonons with the charged system. But the convergence with respect to smearing is done by visual examination :P - I don't yet know of something that quantifies this criterion :( <br><br>you are welcome<br>fzm</blockquote><div apple-content-edited="true"> </div><br></body></html>