<div dir="ltr"><div dir="ltr"><div dir="ltr">On Tue, Aug 31, 2021 at 7:39 AM Kyle Bystrom <<a href="mailto:kylebystrom@gmail.com">kylebystrom@gmail.com</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello QE developers,<div><div><br></div><div>I noticed that Meta-GGA functionals in QE are currently only supported for Norm-Conserving pseudopotentials, not USPP or PAW. I had seen previous discussion saying that this is because Meta-GGAs are too numerically unstable for PAW, but I was wondering if this might be changing now that more stable functionals like r2SCAN have been developed. Are there any plans to add capability to perform Meta-GGA calculations with PAW?</div></div></div></blockquote><div><br></div><div>it is not that simple: with PAW and USPP, the kinetic energy density has an "augmentation" term. It can be computed but it seems to me that its implementation is more akin to a full-fledged project than to something that can be done in the spare time.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div> Relatedly, I was wondering if the <a href="http://www.quantum-espresso.org/pseudopotentials/unified-pseudopotential-format" target="_blank">major overhaul</a> of the UPF format mentioned on the website might include the ability to store core kinetic energy density for use in Meta-GGAs.</div></div></div></blockquote><div><br></div><div>For the time being, the "major" overhaul is limited to the definition of a xml schema (see <a href="https://www.quantum-espresso.org/resources/road-map/qe_pp-0.99.xsd.xml">https://www.quantum-espresso.org/resources/road-map/qe_pp-0.99.xsd.xml</a>) and does not touch its contents. The format might for sure be extended to include atomic kinetic energy density, but somebody has to generate the needed quantities.<br></div><div><br></div><div>Paolo<br></div><div> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><br></div><div>Thank you,<br></div><div>Kyle</div><div><span style="color:rgb(136,136,136)">--</span><br style="color:rgb(136,136,136)"><div dir="ltr" style="color:rgb(136,136,136)"><div dir="ltr"><div><div dir="ltr"><div>Kyle Bystrom</div><div>PhD Student, Applied Physics</div><div>Harvard School of Engineering and Applied Sciences</div></div></div></div></div></div></div>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Paolo Giannozzi, Dip. Scienze Matematiche Informatiche e Fisiche,<br>Univ. Udine, via delle Scienze 206, 33100 Udine, Italy<br>Phone +39-0432-558216, fax +39-0432-558222<br><br></div></div></div></div></div></div></div>