<div dir="ltr"><div><div><div>Hi,<br><br></div>The file Modules/funct.f90 is well commented and the user is invited to read it in the documentation. For example, if you chose input_dft = 'vdw-df', the internal indices will be forced to be<br><br> iexch = 1 ! Exchange<br> icorr = 4 ! Correlation<br> igcx = 4 ! Gradient Correction on Exchange<br> igcc = 0 ! Gradient Correction on Correlation<br> inlc = 1 ! Van der Waals functionals (nonlocal term only)<br> imeta=0 ! Meta-GGA functionals<br><br></div>When generating your PP with the ld1.x code, this same module is used and if you set dft = 'PBE' you have<br><br> iexch = 1 ! Exchange<br> icorr = 4 ! Correlation<br> igcx = 3 ! Gradient Correction on Exchange<br> igcc = 4 ! Gradient Correction on Correlation<br> inlc = 0 ! Van der Waals functionals (nonlocal term only)<br> imeta = 0 ! Meta-GGA functionals<br><br></div>And if you set dft = 'revBPE' you have <br><br> iexch = 1 ! Exchange<br> icorr = 4 ! Correlation<br> igcx = 4 ! Gradient Correction on Exchange<br> igcc = 4 ! Gradient Correction on Correlation<br> inlc = 0 ! Van der Waals functionals (nonlocal term only)<br> imeta = 0 ! Meta-GGA functionals<br><br><div><div><div>So, notice that if you use a PP generated with dft = 'PBE' and set input_dft = 'vdw-df' in your pw.x input file, the gradient correction on exchange used in your solid-state calculation and the one used to generate the PP are not the same. So, I think you must generate you PP with dft = 'revBPE'. The gradient correction on correlation will be the same of PBE, but in the solid-state calculation it will be replaced by the non-local correlation contribution as implemented in the file Modules/xc_vdW_DF.f90. Try to follow the same logic for other values of input_dft. With respect to the PPs, you can start from the pslibrary<br><br><a href="http://www.quantum-espresso.org/pseudopotentials/pslibrary/" target="_blank">http://www.quantum-espresso.or<wbr>g/pseudopotentials/pslibrary/</a><br></div><div><br><span class="m_6275384104434619468gmail-m_-4323175091617837572m_-2765941896586964155m_-8841004571003497628gmail-m_6597902561809868640m_-6321344893763153737m_6333377370348176066gmail-m_-7443609597193345283gmail-m_-4627483426385706070m_-3659475676208332197gmail-m_318366166282958700m_-4069557267744183932m_3925019048408858411m_5074883181905464774gmail-il">Ary Ferreira<br></span><span class="m_6275384104434619468gmail-m_-4323175091617837572m_-2765941896586964155m_-8841004571003497628gmail-m_6597902561809868640m_-6321344893763153737m_6333377370348176066gmail-m_-7443609597193345283gmail-m_-4627483426385706070m_-3659475676208332197gmail-m_318366166282958700m_-4069557267744183932m_3925019048408858411m_5074883181905464774gmail-il"><br><span class="m_6275384104434619468gmail-m_-4323175091617837572m_-2765941896586964155m_-8841004571003497628gmail-m_6597902561809868640m_-6321344893763153737m_6333377370348176066gmail-m_-7443609597193345283gmail-il"><span class="m_6275384104434619468gmail-m_-4323175091617837572m_-2765941896586964155m_-8841004571003497628gmail-il">FAPESP</span></span> </span><span class="m_6275384104434619468gmail-m_-4323175091617837572m_-2765941896586964155m_-8841004571003497628gmail-m_6597902561809868640m_-6321344893763153737m_6333377370348176066gmail-m_-7443609597193345283gmail-m_-4627483426385706070m_-3659475676208332197gmail-m_318366166282958700m_-4069557267744183932m_3925019048408858411m_5074883181905464774gmail-il"><span class="m_6275384104434619468gmail-m_-4323175091617837572m_-2765941896586964155m_-8841004571003497628gmail-il">postdoctoral</span></span> fellow<br><span class="m_6275384104434619468gmail-m_-4323175091617837572m_-2765941896586964155m_-8841004571003497628gmail-m_6597902561809868640m_-6321344893763153737m_6333377370348176066gmail-il">UFSCar</span> - Brazil<br><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jun 5, 2017 at 2:13 PM, Vikan Manmathan <span dir="ltr"><<a href="mailto:vikanmanmathan1@gmail.com" target="_blank">vikanmanmathan1@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><div><div><div>Dear Developers and Experts,<br><br></div>I am interested in studying the adsorption of aromatic molecules on the metal surfaces. From the literature, it is shown that the van der Waal's interactions play a significant role in such systems and the optimized versions of the vDW-DF functional best describe the structural and electronic features. More details can be found on these reports, (J. Chem. Phys. 140, 084704 (2014), J. Phys. Chem. C 2015, 119, 1886−1897 and J. Phys. Chem. Lett. 2016, 7, 2228−2233).<br><br></div>My question is regarding the pseudopotentials.<br></div>Is it a proper way to do the calculations by taking the PBE pseudopotential (available at the quantum Espresso website) and include the van der Waal's interaction using input_dft flag?<br><br></div>Any help is highly appreciated.<br><br></div>Thanks in advance.<br><div><div><div><div><br><br></div><div>Regards,<br></div><div><div><div><div><br><br><br clear="all"><div><div class="m_5659765463990026636gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><span style="background-color:rgb(255,255,255)"><b><font size="2">NANDHA KUMAR V.</font></b></span><br></div><span style="background-color:rgb(238,238,238)"><span></span></span><font color="#0b5394"><font face="tahoma,sans-serif">Research scholar,<br></font></font><div><div><div><div><div><span style="color:rgb(32,18,77)">IISER, PUNE.<span style="background-color:rgb(0,0,0)"><span></span></span><span style="background-color:rgb(243,243,243)"><span></span></span></span><br></div></div></div></div></div></div></div></div></div></div>
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