<div dir="ltr"><div>In addition to what Ari wrote, are you sure you are using the same settings in the two calculations? Why are PAW-related terms of the energy zero when using +U?</div><div>The Hubbard energy is very little. that is probably related to the fact that Sn is d10. Are you sure you are doing what other people are doing in literature? <br></div><div><br></div><div>Best,</div><div><br></div><div>Matteo<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il giorno dom 3 nov 2019 alle ore 08:54 후신 부지드 <<a href="mailto:bouzid@skku.edu">bouzid@skku.edu</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"><u></u><div style="font-family:굴림;font-size:10pt"><p>Hello,</p><p>As indicated in the literature (for example <a href="https://www.sciencedirect.com/science/article/pii/S0927025616300672" target="_blank">https://www.sciencedirect.com/science/article/pii/S0927025616300672</a>) people apply a Hubbard potential around 8 or 9 eV to correct the band gap of pure SnS2 from around 1.3 eV with only GGA to around 2 eV after applying U.</p><p>Knowing that Sn d orbital is closed shell orbital (d10), I applied U of 9 eV but band gap is not changing unlike what is reported in the literature, is it because it is closed shell, if so why it worked for other people ?</p><p>I'm attaching the result of the calculation with and without U, and the density of states for both which look the same.<br></p><p>Best<br></p><img src="http://ptmsg.skku.edu/emate_app/ematemdn.nsf/mdnform?OpenForm&sender=bouzid@skku.edu&receiver=users@lists.quantum-espresso.org&key=E455F3F7280BDC0A492584A6004F55D7" width="0" height="0" border="0"></div>_______________________________________________<br>
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