<div dir="ltr">Hi Roberto,<div><br></div><div>a few things that might help</div><div><br></div><div>- different starting magnetization (if spin-polarized), e.g. a starting magnetization of 0.4 could lead to a converged value of 0.7 but starting from 0.7 might fail</div><div>- different surface-atom hubbard_U values: I played a bit with the linear response formalism to determine Hubbard_U values and atoms on surfaces seems to have a different response to hubbard_alpha</div><div>- dipfield (or related corrections using assume_isolated)</div><div>- sometimes it just takes very long electron_maxstep~300-500</div><div><br></div><div>if you have an input file I would be happy to try it a bit myself, these "convergence problems" are very interesting to play with and overcome!</div><div><br></div><div>HTH!</div><div>Chris <br><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jul 1, 2018 at 7:00 PM, <span dir="ltr"><<a href="mailto:users-request@lists.quantum-espresso.org" target="_blank">users-request@lists.quantum-espresso.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send users mailing list submissions to<br>
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1. DFT+U and surfaces -- convergence (Roberto Gomes de Aguiar Veiga)<br>
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Message: 1<br>
Date: Sat, 30 Jun 2018 11:28:07 -0300<br>
From: Roberto Gomes de Aguiar Veiga <<a href="mailto:roberto.veiga@ufabc.edu.br">roberto.veiga@ufabc.edu.br</a>><br>
To: <a href="mailto:users@lists.quantum-espresso.org">users@lists.quantum-espresso.<wbr>org</a><br>
Subject: [QE-users] DFT+U and surfaces -- convergence<br>
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Dear Espresso users, <br>
<br>
my question is not related to any specific system, since it always<br>
happened to all of them. When I perform DFT+U calculations for bulk<br>
systems (e.g., NiO, Fe2O3, YIG, etc), they usually converge very<br>
quickly. However, when I try to perform calculations for the<br>
corresponding surfaces, they do not converge. I've been using<br>
mixing_mode='local-TF' and descreasing mixing_beta to values as low as<br>
0.05 for the surface calculations, with no success. Can any of you with<br>
experience in this kind of simulation (DFT+U and surfaces) share what<br>
you usually do to have converged calculations? <br>
<br>
Best regards, <br>
<br>
Roberto <br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Postdoctoral Researcher<br>Center for Quantum Nanoscience, Institute for Basic Science<br>Ewha Womans University, Seoul, South Korea<blockquote type="cite" style="font-size:12.8px"><div dir="ltr"><div><div dir="ltr"></div></div></div></blockquote></div></div>
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