<div>Dear Nick,</div><div><br></div><div>I am not too familiar with that functional. If I understand the documentation of LibXC correctly, then your setup should be correct. In the literatur, people apparently use the same combination of functionals.</div><div>Can you share your input file? With the scarce amount of information you provide, it is difficult to estimate what causes the deviation. It can be a too low cutoff, the wrong pseudo potential, the basis set etc.</div><div><br></div><div>Best,</div><div>Frederick<br></div><br><div class="gmail_quote"><div dir="auto" class="gmail_attr">nwi...@berkeley.edu schrieb am Dienstag, 28. Juni 2022 um 22:26:29 UTC+2:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Does anybody happen to know how to properly use the LIBXC implementation of the TB09 meta GGA exchange functional? I've applied it to GaAs with tight k-point sampling and the resultant DOS still has a band gap of ~0.7 eV when the literature shows TB09 should give ~1.5eV<div><br></div><div>I've accessed it using </div><div><br></div><div>&XC_FUNCTIONAL</div><div> &MGGA_X_TB09</div><div> &END</div><div> &LDA_C_PW</div><div> &END</div><div>&END</div><div><br></div><div>The TB09 MGGA has a self consistent solution for the parameter "c" in the original implementation, is that not being done here?</div><div><br></div><div>Not too familiar with how libxc works under the hood but maybe someone else does.</div><div><br></div><div>-Nick</div></blockquote></div>
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