<div dir="ltr"><div dir="ltr">On Wed, Mar 10, 2021 at 1:42 PM Konrad Gruszka via users <<a href="mailto:users@lists.quantum-espresso.org">users@lists.quantum-espresso.org</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Until now, I was quite sure, that if I incorrectly choose occupations to <br>
'fixed', QE will show me known "System is metallic, smearing is needed" <br>
error and then interrupt my calculation. </blockquote><div><br></div><div>There are two different errors in the code:</div><div>- "the system is metallic, specify occupations"</div><div><div>- "charge is wrong: smearing is needed"</div></div><div><br></div><div>the first one always occurs if you have an odd number of electrons with fixed occupations; otherwise, if you use fixed occupancies for a metal, during self-consistency the second error is often, but not always, encountered.<br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Now, after I made my calculation with occupations='fixed', I got:<br>
<br>
"highest occupied, lowest unoccupied level (ev): 4.8994 3.9581"<br>
<br>
which I interpret as metal, yet no "smearing needed" error occur.<br></blockquote><div><br></div><div>it is (it means that the lowest N+1-th state is lower in energy than the highest N-th state, where N=Z/2) and may occasionally happen with no error<br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
In addition, in the XML files made after SCF/NSCF calculations show <br>
totally different FERMI/HOMO/LUMO close to about 0.177eV/0.18/0.145.<br></blockquote><div><br></div><div>energies in the xml data file are in atomic (Hartree) units, not in eV.<br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Is there no more "system is metallic" message? </blockquote><div><br></div><div>both errors are still there and AFAIK they work (or do not work) as usual<br></div><div><br></div><div>Paolo<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<br>
Konrad Gruszka<br>
<br>
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