<div dir="ltr">DearĀ <span style="font-size:12.8px">Bhushan,</span><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">The best cutoff energy should be the well tested one, which satisfies your requests. Generally, I would use the largest cutoff energy for the wavefunction in the pseudopotential files as the start point.</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">I don't think there is a very clear boundary line between uspp and ncpp, and, the energy range of ncpp can also be very large. Generally, ncpp would be more expensive than uspp.</span></div><div><span style="font-size:12.8px">What kind of pseudopotential you use should depend on your request again. Nobody requires that you must us this or that kind of pseudopotential. The one that gives the real physics is the best one.</span></div><div><span style="font-size:12.8px"><br></span></div><div><span style="font-size:12.8px">Best,</span></div><div><span style="font-size:12.8px">Tan</span></div><div><span style="font-size:12.8px">THU</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Aug 24, 2017 at 7:33 PM, B S Bhushan <span dir="ltr"><<a href="mailto:ecebhushan@gmail.com" target="_blank">ecebhushan@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Dear Experts,<br><br></div>I'm new to Quantum Espresso. As a starter, I have got few questions while performing simulations.<br><br></div>(1) In what range the wavefunction cutoff range for Ultrasoft, normconserving and PAW pseudopotentials lies? <br><div><div><div><div><div>I read on google that, for ultrasoft pseudopotentials the wavefunction cutoff ranges from 20-50 Ry, while for norm-conserving pseudopotentials it is from 60-100 Ry. Is it correct ?. or the norm-conserving pseudopotentials can also have range starting from 20-100 Ry ?.<br><br></div><div>(2) I am simulating defects in graphene. Which pseudopotential should I prefer for graphene, Ultrasoft or Norm-conserving or PAW ?<br><br><br></div><div>I am really thankful for your valuable time and knowledge.<br><br></div><div>Thank you.<br></div><div><br><br></div><div>Sincerely,<br></div><div>B. S. Bhushan,<br></div><div>CNT Laboratory,<br></div><div>ABV - Indian Institute of Information Technology and Management, <br>Gwalior, India.<br></div><div><br></div></div></div></div></div></div>
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Department of physics, THU.
Beijing 100084, China
Office: B403,New Science Building
E-mail:<a href="mailto:E-mail%3Athx13@mails.tsinghua.edu.cn" target="_blank">t</a><a href="mailto:anhx90@gmail.com" target="_blank">anhx90@gmail.com</a></pre></div></div></div></div></div></div></div></div>
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