<div dir="ltr"><div>Please specify which version of the code you are referring to and provide if possible an input and an output. There has been a lot of work recently on hybrid functionals and no evidence that "gamma tricks" do not work, except in one specific case that is being investigated<br><br></div>Paolo<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Nov 9, 2016 at 1:17 PM, Tiana Davide <span dir="ltr"><<a href="mailto:davide.tiana@epfl.ch" target="_blank">davide.tiana@epfl.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear all,<br>
<br>
I just want to report a problems I found running hybrid calculations (pbe0, hse, but also gaupbe).<br>
In practice if you run using KPOINTS{gamma} pw crashes with this error:<br>
<br>
Error in routine electrons (1):<br>
dexx is negative! Check that exxdiv_treatment is appropriate for the system<br>
<br>
However, running at gamma point without approximation KPOINT(automatic) 1 1 1 0 0 0 everything goes smoothly and pw got slowly to convergence.<br>
<br>
Considering the speed-up one can get using the gamma approximation I was wondering if it can this be fixed or if somehow this is normal and simply hybrid functional cannot be run using gamma approx<br>
<br>
Cheers<br>
Davide<br>
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</blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,<br>Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>Phone +39-0432-558216, fax +39-0432-558222<br><br></div></div></div></div></div>
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