<div dir="ltr">Dear Prof. Baroni,<div><br></div><div>Thank you for raising this concern. Actually, this is what I am looking for but somehow I couldn't manage to clearly state in my question earlier. </div><div>I'm doing some solid benchmarking with the following studies:</div><div>Phys. Rev. B 93, 155104 (2016)</div><div>Phys. Rev. B 98, 155309 (2018)<br></div><div>to reproduce and understand their results, meanwhile, I'm concerned about the very issue that you raised in your email. </div><div><br></div><div><br></div><div>Kind regards,</div><div><span style="color:rgb(136,136,136)">--</span></div><div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr" style="color:rgb(136,136,136)"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><font size="2">Z. Khatibi</font></div><div><span style="font-family:arial;border-collapse:separate">Postdoctoral fellow</span></div><div><span style="font-family:arial;border-collapse:separate">School of Physics</span></div><div><span style="font-family:arial;border-collapse:separate">Trinity College Dublin</span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 26, 2021 at 8:17 PM Stefano Baroni <<a href="mailto:baroni@sissa.it">baroni@sissa.it</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto">My question is: how far can you trust the overall accuracy of a numerical dft calculation to that extreme limit? SB<br><br><div dir="ltr"><div><span style="background-color:rgba(255,255,255,0)">___</span></div><div><span style="background-color:rgba(255,255,255,0)">Stefano Baroni, Trieste -- <a href="http://stefano.baroni.me" target="_blank">http://stefano.baroni.me</a></span></div></div><div dir="ltr"><br><blockquote type="cite">On 26 Jan 2021, at 18:24, Zahra Khatibi <<a href="mailto:za.khatibi@gmail.com" target="_blank">za.khatibi@gmail.com</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr">Dear all, <div><br></div><div><br></div><div>I am currency using ncsf calculation to produce band dispersion. I need to generate high precision eigenvalues, e.g. as small as 0.01 meV. I managed to increase the number of decimal digits shown after the decimal point in the standard output by modifying subroutine <i>print_ks_energies.f90</i> in QE version 6.5 (format 9030 from 8F9.4 to 8F9.5). </div><div>My question is, how far can I go for increasing the number of decimal digits shown in the output, and what parameter dictates the precision of eigenvalues?</div><div><br></div><div><br></div><div>Kind regards,</div><div><span style="color:rgb(136,136,136)">--</span><br></div><div><div><div dir="ltr"><div dir="ltr"><div dir="ltr" style="color:rgb(136,136,136)"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><font size="2">Z. Khatibi</font></div><div><span style="font-family:arial;border-collapse:separate">Postdoctoral fellow</span></div><div><span style="font-family:arial;border-collapse:separate">School of Physics</span></div><div><span style="font-family:arial;border-collapse:separate">Trinity College Dublin</span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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