<div dir="ltr"><div>Dear Lorenzo,</div><div><br></div><div>the variable starting_magnetization is usually used to drive the system</div><div>out of the non magnetic solution, in that starting_magnetization(i) = 0 for all atomic species</div><div>should always bring to a spin unpolarized system. The starting value in some cases is not so important</div><div>(different values will produce the same magnetic ground state), but as far as I remember it could be</div><div>in some (not so frequent) cases where different magnetic energy minima exist.</div><div><br></div><div>For the other questions:</div><div>- no special attention paid to the pseudopotential choice, if you mean to choose a pseudopotential "specific"</div><div>for a spin-polarized calculation</div><div>- I would not use the input_DFT variable unless you need it for specific purposes (e.g. non local functionals, like vdw-DF).</div><div><br></div><div>Ciao,</div><div>Giovanni</div><div><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><span style="color:rgb(0,0,0)">-- <br><br>Giovanni Cantele, PhD<br>CNR-SPIN<br>c/o Dipartimento di Fisica<br>Universita' di Napoli "Federico II"<br>Complesso Universitario M. S. Angelo - Ed. 6<br>Via Cintia, I-80126, Napoli, Italy<br><a href="mailto:giovanni.cantele@spin.cnr.it" style="color:rgb(17,85,204)" target="_blank">e-mail: giovanni.cantele@spin.cnr.it</a><br>Phone: +39 081 676910<br>Skype contact: giocan74<br><br>ResearcherID: <a href="http://www.researcherid.com/rid/A-1951-2009" style="color:rgb(17,85,204)" target="_blank">http://www.researcherid.com/rid/A-1951-2009</a><br>Web page: </span><a href="https://sites.google.com/view/giovanni-cantele/home" style="color:rgb(17,85,204)" target="_blank">https://sites.google.com/view/giovanni-cantele/home</a><br></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">Il giorno sab 19 apr 2025 alle ore 16:37 Lorenzo Sponza <<a href="mailto:lorenzo.sponza@onera.fr">lorenzo.sponza@onera.fr</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear Quantum ESPRESSO users and developpers,<br>
<br>
I need some help to set up a calculation of a Si(111) 1x1 surface. This <br>
surface is characterized by dangling bonds that spoil the electronic <br>
states around Fermi. In literature, two approaches are usually adopted. <br>
One consists in saturating the surface with H atoms, the other consists <br>
in performing a spin polarized calculation.<br>
I want to give both methods a try, but I stuck when it comes to set up <br>
the spin polarized input file. I set nspin=2, but I'm perplexed about <br>
the value to give to starting_magnetization since I have only Si atoms <br>
here, and in this specific case it is not clear to me how this variable <br>
is interpreted and used by the code.<br>
Finally, is there any attention to be paid in choosing the <br>
pseudopotential or in specifying the input_DFT variable? I've used PBE <br>
scalar relativistic PAW pseudos so far.<br>
<br>
Many thanks for your help.<br>
<br>
-- <br>
Dr. Lorenzo Sponza<br>
<br>
Chargé de Recherche au CNRS<br>
Université Paris-Saclay, ONERA, CNRS Laboratoire d'étude des <br>
microstructures (LEM)<br>
29 Avenue de la division Leclerc, 92322 Châtillon<br>
Tel: +33146734464<br>
<br>
ETSF Research Team Leader<br>
European Theoretical Spectroscopy Facility<br>
17 Sart-Tilman B-4000 Liège, Belgium<br>
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