Hi Yukihiro,<div><br></div><div>QE have an implementation of VdW interactions done in this publication:</div><div><p class="MsoEndnoteText" style="margin-left:.3in;text-align:justify;text-indent:
-.3in"><span style="font-size:11.0pt">Barone, V., Casarin, M., Forrer, D.,
Pavone, M., Sambi, M. & Vittadini, A.,<i style="mso-bidi-font-style:normal">
J. Comput. Chem.</i> <b style="mso-bidi-font-weight:normal">2009</b>,<i style="mso-bidi-font-style:normal"> 30</i>, 934-939.</span></p><p class="MsoEndnoteText" style="margin-left:.3in;text-align:justify;text-indent:
-.3in"><font class="Apple-style-span" size="4"><span class="Apple-style-span" style="font-size: 15px;">In order to do the SCF calculations including VdW interactions you only need to add this tag on the &SYSTEM part of the input:</span></font></p>
<p class="MsoEndnoteText" style="margin-left:.3in;text-align:justify;text-indent:
-.3in"><font class="Apple-style-span" size="4"><span class="Apple-style-span" style="font-size: 15px;">london=.true.</span></font></p><p class="MsoEndnoteText" style="margin-left:.3in;text-align:justify;text-indent:
-.3in"><span class="Apple-style-span" style="font-size: 15px; ">That's it.</span></p><p class="MsoEndnoteText" style="margin-left:.3in;text-align:justify;text-indent:
-.3in"><span style="font-size:11.0pt">Juan.</span></p><br><div class="gmail_quote">On Thu, Nov 4, 2010 at 9:42 PM, <span dir="ltr"><<a href="mailto:yukihiro_okuno@fujifilm.co.jp">yukihiro_okuno@fujifilm.co.jp</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><br>
Dear PWSCF users and developers.<br>
<br>
I want to calculate the interaction of molecules which interact<br>
<br>
by Van der Waals forces.<br>
<br>
And , there are some developments of the treatment of Van der Waals<br>
<br>
interaction within density functional theory like,<br>
<br>
M.Dion et al Phys. Rev Lett. vol 92 246401 (2004)<br>
T.Thonhauser et al Phys.Rev.B vol 76 125112 (2007)<br>
<br>
and others.<br>
<br>
Are there any plan implement such a Van der Waals functional in PWSCF ?<br>
<br>
and, in PWSCF there are VdW directory and what this code calculate and<br>
<br>
how to use it ? There are no document in /Docs/INPUT_VdW.<br>
<br>
Sincerely,<br>
<br>
Yukihiro Okuno.<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Best regards, <br>-------------------------------------- <br>Juan M. Lopez Encarnacion<br>Research associate, Institute of Physics, Universidad Autónoma de Santo Domingo, Dominican Republic<br>
Graduate Student Doctoral Program in Chemical Physics, University of Puerto Rico, Rio Piedras Campus <br>P.O.Box 23343 <br>San Juan, PR 00931-3343 <br><br>
</div>