<div dir="ltr"><div>You should add a smearing, even if you think that your system is not metallic (if you think it is, you MUST add a smearing). Something like occupations='smearing', smearing='gaussian', degauss=0.01 to 0.05 or so. You might also try a spin-polarized calculation.<br><br></div>Paolo<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Dec 27, 2017 at 3:51 AM, lt15 <span dir="ltr"><<a href="mailto:lt15@rice.edu" target="_blank">lt15@rice.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hi<br>
<br>
I was doing a 'scf' calculation for a defected h-BN structure as shown in the attached figures. I would like to obtain the charge density of the layer especially around the defect. But I found the calculation couldn't converge as the 'estimated scf accuracy' in the output file keeps fluctuating. In the input file, I tested different mixing_mode like 'plain' and 'local-TF'. or the mixing_beta value like 0.01. 0.1, 0.3, 0.7. But still, it didn't converge even after 8 hours running. In structure in-a, the defected boron atom was far away from its original lattice position, as shown in in-a.png. In structure in-b, the defected boron atom plus a nitrogen atom around the edge of layer were deleted, as shown in in-b.png. In structure in-b, the layer still maintained neutral electricity and kept the void defect in the center. However, neither structure can converge. Could you give some suggestions about the convergence issue for this defected structure? Thank you.<br>
<br>
best,<br>
Lei<br>
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