<meta http-equiv="Content-Type" content="text/html; charset=GB18030"><div><span style="font-family: "Microsoft YaHei"; font-size: medium;">Dear All,</span></div><div><span style="font-family: "Microsoft YaHei"; font-size: medium;"><br></span></div><div><span style="font-family: "Microsoft YaHei"; font-size: medium;">In the user guide, I found the following information, but where can I get the index notation for M06 exchange included in libxc?</span></div><div><span style="font-family: "Microsoft YaHei"; font-size: medium;"><br></span></div><div><font face="Times New Roman"><i><span style="font-size: medium;">"In order to use </span><tt>libxc</tt><span style="font-size: medium;"> functionals, you can enforce them from input by including the </span><tt>input_dft</tt><span style="font-size: medium;"> string in the </span><tt>system</tt><span style="font-size: medium;"> namelist. Starting from v7.0 of Q</span><small style="">UANTUM </small><span style="font-size: medium;">ESPRESSO the only allowed notation for DFTs that include Libxc terms is the index one. For example, to use the </span><tt>libxc</tt><span style="font-size: medium;"> version of the PBE functional (both exchange and correlation):</span></i></font><pre><font face="Times New Roman"><i>input_dft = `XC-000I-000I-101L-130L-000I-000I'
</i></font></pre><font face="Times New Roman"><i><span style="font-size: medium;">The letters I or L next to each ID stand for Internal and </span><tt>libxc</tt><span style="font-size: medium;">. This is equivalent to the old full-name notation:</span></i></font><pre><font face="Times New Roman"><i>input_dft = `gga_x_pbe gga_c_pbe' ***OLD***
</i></font></pre><font face="Times New Roman"><i><span style="font-size: medium;">The order must be the usual one, namely LDA exchange, LDA correlation, GGA exchange, GGA correlation, MGGA exchange, MGGA correlation. </span><tt>libxc</tt><span style="font-size: medium;"> exchange+correlation functionals can be put in the exchange or in the correlation slot with no difference.</span><br style="font-size: medium;"><span style="font-size: medium;">The reason why the full-name notation has been disabled is to eliminate the risk of overlaps among different names (occurring especially when combinations of internal and </span><tt>libxc</tt><span style="font-size: medium;"> DFTs are used).</span><br style="font-size: medium;"><span style="font-size: medium;">The complete list of </span><tt>libxc</tt><span style="font-size: medium;"> functionals (and their IDs) is available at:</span></i></font><pre><font face="Times New Roman"><i>https://www.tddft.org/programs/libxc/functionals/
</i></font></pre><font face="Times New Roman"><i><span style="font-size: medium;">Combinations of Q</span><small style="">UANTUM </small><span style="font-size: medium;">ESPRESSO and </span><tt>libxc</tt><span style="font-size: medium;"> functionals are allowed in </span><tt>PW</tt><span style="font-size: medium;">, but some attention has to be paid to their reciprocal compatibility (see section below).</span><br style="font-size: medium;"><span style="font-size: medium;">For example, the internal exchange term of PBE together with the correlation term of PBE in </span><tt>libxc</tt><span style="font-size: medium;"> is obtained by:</span></i></font><pre><font face="Times New Roman"><i>input_dft = `XC-001I-000I-003L-130L-000I-000I'
</i></font></pre><span style="font-size: medium;"><font face="Times New Roman"><i>which corresponds to the old:</i></font></span><pre><font face="Times New Roman"><i>input_dft = `sla pbx gga_c_pbe' ***OLD***
</i></font></pre><font face="Times New Roman"><i><span style="font-size: medium;">Note that when using GGA internal functionals you must always specify the LDA term too, while it is not the case for the </span><tt>libxc</tt><span style="font-size: medium;"> ones.</span><br style="font-size: medium;"><span style="font-size: medium;">Abbreviations are allowed when zero tails are present. The above example is still valid by putting:</span></i></font><pre><font face="Times New Roman"><i>input_dft = `XC-001I-000I-003L-130L'
</i></font></pre><font face="Times New Roman"><i><span style="font-size: medium;">since no MGGA terms are present.</span><br style="font-size: medium;"><span style="font-size: medium;">Non-local terms can be included by just adding their name after the index notation, for example:</span></i></font><pre><font face="Times New Roman"><i>input_dft=`XC-001i-004i-013i-vdw2'</i></font>"</pre><pre><span style="font-family: Arial; font-size: small;"><br></span></pre><pre><span style="font-family: Arial; font-size: small;">Best</span></pre></div><div><hr align="left" style="margin: 0 0 10px 0;border: 0;border-bottom:1px solid #E4E5E6;height:0;line-height:0;font-size:0;padding: 20px 0 0 0;width: 50px;"><div style="font-size:14px;font-family:Verdana;color:#000;"><p><font face="Arial" size="1">Jibiao Li</font></p><p><font face="Arial" size="1">Department of Materials Science and Engineering</font></p><p><font face="Arial" size="1">Yangtze Normal University</font></p><p><font face="Arial" size="1">Juxian Avenue 16, Fuling, Chongqing, China 408100</font></p><p><font face="Arial" size="1"></font></p><p><font face="Arial" size="1">Scopus Research ID: <a href="https://www.scopus.com/authid/detail.uri?authorId=54944118000"><font face="Arial"><font face="Arial"><font face="Arial"><font face="Arial">54944118000</font></font></font></font></a></font></p><p><font face="Arial" size="1">Web of Science Research ID: <span style="border: 1px none windowtext; padding: 0px;"><a href="https://publons.com/researcher/2283103/jibiao-li/" target="_blank" title="https://publons.com/researcher/2283103/jibiao-li/" style="">F-1905-2016</a></span></font></p><p><font face="Arial" size="2" style="font-family: Arial; font-size: small; margin: 0px; padding: 0px; border: 0px; outline-style: initial; outline-width: 0px; font-variant-numeric: inherit; font-variant-east-asian: inherit; font-stretch: inherit; line-height: inherit; vertical-align: top; -webkit-font-smoothing: antialiased; white-space: normal; color: rgb(0, 0, 0) !important;"><font face="Arial"><font face="Arial"><span style="font-style: inherit; font-variant: inherit; font-weight: inherit; font-stretch: inherit; line-height: inherit; margin: 0px; padding: 0px; border: 0px; outline: 0px; vertical-align: top; -webkit-font-smoothing: antialiased;"><a href="https://publons.com/researcher/2283103/jibiao-li/" title="https://publons.com/researcher/2283103/jibiao-li/" target="_blank"></a></span></font></font></font><br></p></div></div><div> </div>