<div><br></div><div><br></div>Well<div>Let's say that you should have a good reason to use all-electrons and hybrid-functionals with no ADMM for a BOMD simulation of a condensed matter system. </div><div>Moreover one should consider that graphene is semi-metallic and the convergence might be strongly dependent on the system size as well as other parameters/conditions. </div><div>In the literature you can find many DFT studies of water/graphene interfaces, I would start from there to figure out which are the optimal settings to correctly reproduce electronic, structural and dynamic properties. </div><div>Regards</div><div>Marcella</div><div><br><br></div><div class="gmail_quote"><div dir="auto" class="gmail_attr">On Monday, August 29, 2022 at 9:37:05 AM UTC+2 Alex wrote:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Hi everyone,<div><br></div><div>I am trying set up a dftmd simulation (room-temp NVT, rectangular box periodic in XYZ) of a tiny solvated sheet of graphene (~1700 electrons total). I am using the following as my starting point for the force calculation: <a href="https://github.com/misteliy/cp2k/blob/master/tests/QS/regtest-hybrid/H2O-hybrid-b3lyp.inp" target="_blank" rel="nofollow" data-saferedirecturl="https://www.google.com/url?hl=en&q=https://github.com/misteliy/cp2k/blob/master/tests/QS/regtest-hybrid/H2O-hybrid-b3lyp.inp&source=gmail&ust=1661856368629000&usg=AOvVaw3m4kTwuUmBZZTKNi3SNkns">https://github.com/misteliy/cp2k/blob/master/tests/QS/regtest-hybrid/H2O-hybrid-b3lyp.inp</a> -- the only two major changes being POISSON set to be periodic in xyz and I'm also adding D3 corrections. </div><div>The initial structure comes from classical MD and SCF is refusing to converge with that dreaded huge oscillation. Should I abandon this idea and use something much more familiar to me (say, PBE + GTH potentials) or am I setting it up incorrectly? </div><div>Thank you,</div><div><br></div><div>Alex</div></blockquote></div>
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