<div dir="ltr">Dear Lei,<div><br></div><div>Since you are handling with lanthanides like Eu, I suggest not using BS (broken symmetry). Rather I suggest high spin as the starting guess or invoke spin-orbit coupling. This may work.</div><div><br></div><div><br></div><div>All the best,<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><span style="font-size:11pt"><font face="arial, sans-serif">Arup Sarkar</font></span></div><div><span style="font-size:11pt"><font face="times new roman, serif">Postdoctoral Researcher </font></span></div><div><span style="font-size:14.6667px"><font face="times new roman, serif">Max Planck Institute for Polymer Research</font></span></div><div><br></div><div><font face="times new roman, serif"></font></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jul 30, 2024 at 11:00 AM Lei Qian <<a href="mailto:ybdssxw@gmail.com">ybdssxw@gmail.com</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">Dear CP2K Users,<div> I am doing a density of stats caculation of CsEuBr3 with 2×2×2 supercell . I used DZVP-MOLOPTGTH basis set and GTH-PBE pseudopotential under PBE functional for Cs and Br. For Eu , I used DZV-MOLOPTGTH basis set from the file of BASIS_MOLOPT_LnPP1 and GTH-PBE pseudopotential from the file of LnPP1_POTENTIALS under CP2K/data file .</div><div>I set the spin multiplicity and used a BS initial guess for the electronic states of the system. The structure optimization converged, but upon calculating the density of states, I found that the band gap is negative . The experimental measurement of the band gap for CsEuBr3 is approximately 2.8 eV . What might cause this discrepancy ? Could someone give me some suggestions? <br></div><div>I have attached the CP2K input and output files.<br></div><div>Thanks in advance for your help!<br></div><br>
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